[IMP] tutorials/*: hide outdated tutorials

*: backend, web, website

task-2991663

X-original-commit: 9561c9abf8
Part-of: odoo/documentation#3660

content/developer/tutorials/backend.rst

@@ -1,3 +1,4 @@
+:orphan:
 
 .. _howto/base:
 .. _howto/module:
@@ -6,6 +7,9 @@
 Building a Module
 =================
 
+.. danger::
+   This tutorial is outdated. We recommend reading :doc:`getting_started` instead.
+
 .. warning::
    This tutorial requires :ref:`having installed Odoo <setup/install>`
 

content/developer/tutorials/web.rst

@@ -4,11 +4,8 @@
 Customizing the web client
 ==========================
 
-.. note::
-
-    this section is really really out of date. It will be updated someday,
-    but meanwhile, this tutorial will probably be frustrating to follow, since it
-    was written a long time ago.
+.. danger::
+   This tutorial is outdated.
 
 .. highlight:: javascript
 

content/developer/tutorials/website.rst

@@ -1,7 +1,12 @@
+:orphan:
+
 ==================
 Building a Website
 ==================
 
+.. danger::
+   This tutorial is outdated. We recommend reading :doc:`getting_started` instead.
+
 .. warning::
 
     * This guide assumes `basic knowledge of Python