[REF][MOV] documentation apocalypse

Prior to this commit, the Odoo documentation was mainly split between
two repositories: odoo/odoo/doc and odoo/documentation-user. Some bits
of documentation were also hosted elsewhere (e.g., wiki, upgrade, ...).
This was causing several problems among which:
  - The theme, config, Makefile, and similar technical resources had to
    be duplicated. This resulted in inconsistent layout, features, and
    build environments from one documentation to another.
  - Some pages did not fit either documentation as they were relevant
    for both users and developers. Some were relevant to neither of the
    two (e.g., DB management).
  - Cross-doc references had to be absolute links and they broke often.
  - Merging large image files in the developer documentation would bloat
    the odoo/odoo repository. Some contributions had to be lightened to
    avoid merging too many images (e.g., Odoo development tutorials).
  - Long-time contributors to the user documentation were chilly about
    going through the merging process of the developer documentation
    because of the runbot, mergebot, `odoo-dev` repository, etc.
  - Some contributors would look for the developer documentation in the
    `odoo/documentation-user` repository.
  - Community issues about the user documentation were submitted on the
    `odoo/odoo` repository and vice-versa.

Merging all documentations in one repository will allow us to have one
place, one theme, one work process, and one set of tools (build
environment, ...) for all of the Odoo docs.

As this is a good opportunity to revamp the layout of the documentation,
a brand new theme replaces the old one. It features a new way to
navigate the documentation, centered on the idea of always letting the
reader know what is the context (enclosing section, child pages, page
structure ...) of the page they are reading. The previous theme would
quickly confuse readers as they navigated the documentation and followed
cross-application links.

The chance is also taken to get rid of all the technical dangling parts,
performance issues, and left-overs. Except for some page-specific JS
scripts, the Odoo theme Sphinx extension is re-written from scratch
based on the latest Sphinx release to benefit from the improvements and
ease future contributions.

task-2351938
task-2352371
task-2205684
task-2352544

Closes #945

static/example_files/External_id_3rd_party_application_product_categories.csv

@@ -0,0 +1,6 @@
+External ID,Name,Parent Category/External ID
+a1,Expenses,product.product_category_all
+a2,Other Products,product.product_category_all
+a3,Sellable Products,product.product_category_all
+a4,Tables,a1
+a5,Seating furniture,a2

static/example_files/External_id_3rd_party_application_products.csv

@@ -0,0 +1,6 @@
+External ID,Name,Internal Reference,Category/External ID,Can be Expensed,Can be Purchased,Can be Sold,Sale Price,Cost,Supply Method,Product Type,Procurement Method
+a6,Aluminum Stool,ALS,a5,False,True,True,49.00,25.00,Buy,Stockable Product,Make to Stock
+a7,Chair,CHR,a5,False,True,True,89.00,40.00,Buy,Stockable Product,Make to Stock
+a8,Table,TBL,a4,False,True,True,169.00,100.00,Buy,Stockable Product,Make to Stock
+a9,Software Book Tutorial,SBT,a2,False,True,False,19.00,8.00,Buy,Consumable,Make to Stock
+a10,Fuel,FL,a1,True,False,False,0.30,0.25,Buy,Service,Make to Stock

static/example_files/database_import_test.sql

@@ -0,0 +1,155 @@
+--
+-- PostgreSQL database dump
+--
+
+SET statement_timeout = 0;
+SET client_encoding = 'UTF8';
+SET standard_conforming_strings = off;
+SET check_function_bodies = false;
+SET client_min_messages = warning;
+SET escape_string_warning = off;
+
+SET search_path = public, pg_catalog;
+
+SET default_tablespace = '';
+
+SET default_with_oids = false;
+
+--
+-- Name: companies; Type: TABLE; Schema: public; Owner: fp; Tablespace: 
+--
+
+CREATE TABLE companies (
+    id integer NOT NULL,
+    company_name character varying
+);
+
+
+ALTER TABLE public.companies OWNER TO fp;
+
+--
+-- Name: companies_id_seq; Type: SEQUENCE; Schema: public; Owner: fp
+--
+
+CREATE SEQUENCE companies_id_seq
+    START WITH 1
+    INCREMENT BY 1
+    NO MAXVALUE
+    NO MINVALUE
+    CACHE 1;
+
+
+ALTER TABLE public.companies_id_seq OWNER TO fp;
+
+--
+-- Name: companies_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: fp
+--
+
+ALTER SEQUENCE companies_id_seq OWNED BY companies.id;
+
+
+--
+-- Name: companies_id_seq; Type: SEQUENCE SET; Schema: public; Owner: fp
+--
+
+SELECT pg_catalog.setval('companies_id_seq', 3, true);
+
+
+--
+-- Name: persons; Type: TABLE; Schema: public; Owner: fp; Tablespace: 
+--
+
+CREATE TABLE persons (
+    id integer NOT NULL,
+    company_id integer,
+    person_name character varying
+);
+
+
+ALTER TABLE public.persons OWNER TO fp;
+
+--
+-- Name: persons_id_seq; Type: SEQUENCE; Schema: public; Owner: fp
+--
+
+CREATE SEQUENCE persons_id_seq
+    START WITH 1
+    INCREMENT BY 1
+    NO MAXVALUE
+    NO MINVALUE
+    CACHE 1;
+
+
+ALTER TABLE public.persons_id_seq OWNER TO fp;
+
+--
+-- Name: persons_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: fp
+--
+
+ALTER SEQUENCE persons_id_seq OWNED BY persons.id;
+
+
+--
+-- Name: persons_id_seq; Type: SEQUENCE SET; Schema: public; Owner: fp
+--
+
+SELECT pg_catalog.setval('persons_id_seq', 4, true);
+
+
+--
+-- Name: id; Type: DEFAULT; Schema: public; Owner: fp
+--
+
+ALTER TABLE ONLY companies ALTER COLUMN id SET DEFAULT nextval('companies_id_seq'::regclass);
+
+
+--
+-- Name: id; Type: DEFAULT; Schema: public; Owner: fp
+--
+
+ALTER TABLE ONLY persons ALTER COLUMN id SET DEFAULT nextval('persons_id_seq'::regclass);
+
+
+--
+-- Data for Name: companies; Type: TABLE DATA; Schema: public; Owner: fp
+--
+
+COPY companies (id, company_name) FROM stdin;
+1	Bigees
+2	Organi
+3	Boum
+\.
+
+
+--
+-- Data for Name: persons; Type: TABLE DATA; Schema: public; Owner: fp
+--
+
+COPY persons (id, company_id, person_name) FROM stdin;
+1	1	Fabien
+2	1	Laurence
+3	2	Eric
+4	3	Ramsy
+\.
+
+
+--
+-- Name: companies_pkey; Type: CONSTRAINT; Schema: public; Owner: fp; Tablespace: 
+--
+
+ALTER TABLE ONLY companies
+    ADD CONSTRAINT companies_pkey PRIMARY KEY (id);
+
+
+--
+-- Name: persons_company_id_fkey; Type: FK CONSTRAINT; Schema: public; Owner: fp
+--
+
+ALTER TABLE ONLY persons
+    ADD CONSTRAINT persons_company_id_fkey FOREIGN KEY (company_id) REFERENCES companies(id);
+
+
+--
+-- PostgreSQL database dump complete
+--
+

static/example_files/m2m_customers_tags.csv

@@ -0,0 +1,6 @@
+Name,Reference,Tags,Customer,Street,City,Country
+Credit & Leasing,3,Services,True,Central Avenue 814,Johannesburg,South Africa
+Services & Finance,5,"Consultancy Services,IT Services",True,Grove Road 5,London,United Kingdom
+Hydra Supplies,6,"Manufacturer,Retailer",True,Palm Street 9,Los Angeles,United States
+Bolts & Screws,8,"Wholesaler,Components Buyer",True,Rua Américo 1000,Campinas,Brazil
+National Parts & Supplies,18,"Manufacturer,Wholesaler",True,Guangdong Way 20,Shenzen,China

static/example_files/o2m_customers_contacts.csv

@@ -0,0 +1,9 @@
+Name,Is a company,Related company,Address type,Customer,Supplier,Street,ZIP,City,State,Country
+Aurora Shelves,1,,,1,0,25 Pacific Road,95101,San José,CA,United States
+Roger Martins,0,Aurora Shelves,Invoice address,1,0,27 Pacific Road,95102,San José,CA,United States
+House Sales Direct,1,,,1,0,104 Saint Mary Avenue,94059,Redwood,CA,United States
+Yvan Holiday,0,House Sales Direct,Contact,1,0,104 Saint Mary Avenue,94060,Redwood,CA,United States
+Jack Unsworth,0,House Sales Direct,Invoice address,1,0,227 Jackson Road,94061,Redwood,CA,United States
+Michael Mason,0,,,1,0,16 5th Avenue,94104,San Francisco,CA,United States
+International Wood,1,,,1,0,748 White House Boulevard,20004,Washington,DC,United States
+Sharon Pecker,0,International Wood,Invoice address,1,0,755 White House Boulevard,20005,Washington,DC,United States

static/example_files/o2m_purchase_order_lines.csv

@@ -0,0 +1,10 @@
+Order Date,Order Reference,Supplier,Destination,Pricelist,Order Lines / Product,Order Lines / Quantity
+2012-12-15,PO00008,ASUSTeK,Stock,Default Purchase Pricelist,ADPT,20
+,,,,,CARD,30
+,,,,,C-Case,40
+2012-12-15,PO00009,Axelor,Stock,Default Purchase Pricelist,CD,5
+,,,,,CPUa8,15
+2012-12-15,PO000010,China Export,Stock,Default Purchase Pricelist,HDD SH-1,10
+,,,,,HDD SH-2,20
+,,,,,LAP-CUS,35
+,,,,,LAP-E5,40

static/example_files/purchase.order_functional_error_line_cant_adpat.csv

@@ -0,0 +1,6 @@
+"Order Reference","Supplier","Destination","Pricelist","Order Lines / Product","Order Lines / Quantity"
+"PO000020","ASUSTeK","Stock","Default Purchase Pricelist","ADPT",20
+,,,,"CARD",30
+,,,,"C-Case",40
+"PO000021","Axelor","Stock","Default Purchase Pricelist","CD",5
+,,,,"CPUa8",15