refactor(admin): Revise introduction chapter

Updated the introduction section to:

- enhance readability and make it more useful
- include additional context and detail

Signed-off-by: Josh <josh.t.richards@gmail.com>

admin_manual/index.rst

@@ -2,42 +2,94 @@
 Introduction
 ============
 
-Welcome to the Nextcloud Server Administration Guide. This guide describes
-administration tasks for Nextcloud, the flexible open source file synchronization
-and sharing solution. Nextcloud includes the Nextcloud server, which runs on
-Linux, client applications for Microsoft Windows, macOS and Linux, and mobile
-clients for the Android and iOS operating systems.
+Welcome to the Nextcloud Server Administration Guide.
 
-Current editions of Nextcloud manuals are always available online at
+This guide explains how to perform administration tasks for Nextcloud, a flexible, open-source platform for file synchronization and content collaboration.
+
+Nextcloud is highly scalable. It runs on anything from a Raspberry Pi with two users to distributed global installations serving tens of millions. You can deploy Nextcloud on-premises, in private or public clouds, or in hybrid environments. With over 400,000 deployments, Nextcloud is a leading on-premises content collaboration platform. It is supported by a large, growing community and is available in over 60 languages.
+
+The latest editions of the Nextcloud manuals are always available online at
 `docs.nextcloud.com <https://docs.nextcloud.com/>`_.
 
-Nextcloud server is available:
-
-* As a free, full featured community-supported server, with all enterprise features.
-* Or with full enterprise support, including phone and email access to Nextcloud developers.
-
-Videos and blogs
-----------------
-
-See the `official Nextcloud channel
-<https://www.youtube.com/c/Nextcloud>`_
-on YouTube for tutorials, overviews, and conference videos.
-
-Visit `our blog <https://nextcloud.com/news/>`_ for latest news and to learn more
-about what is going on in and around Nextcloud.
-
-Target audience
+Target Audience
 ---------------
 
-This guide is for users who want to install, administer, and
-optimize their Nextcloud servers. To learn more about the Nextcloud Web
-user interface, and desktop and mobile clients, please refer to their
-respective manuals:
+This guide is for users who want to:
 
-* `Nextcloud User Manual`_
-* `Nextcloud Desktop Client`_
+- Install Nextcloud Server
+- Administer and manage their instance
+- Optimize server performance
+
+For documentation on Nextcloud web, desktop, or mobile clients, see:
+
+- `Nextcloud User Manual`_
+- `Nextcloud Desktop Client`_
 
 .. _`Nextcloud User Manual`: https://docs.nextcloud.com/server/latest/user_manual/en/
 .. _`Nextcloud Desktop Client`: https://docs.nextcloud.com/desktop/latest/
 
+For documentation on development topics,see:
+
+- The individual repositories on GitHub within `the @nextcloud organization <https://github.com/nextcloud/>`_
+- `Nextcloud Development Manual <https://docs.nextcloud.com/server/latest/developer_manual/>`_
+
 .. TODO ON RELEASE: Update version number above on release
+
+Core Components
+---------------
+
+Nextcloud includes:
+
+- Nextcloud Server (backend running on Linux)
+- A responsive, integrated web client
+- Cross-platform desktop clients (Windows, macOS, and Linux) for file synchronization and local access
+- Dedicated mobile clients (Android and iOS)
+- An extensive app ecosystem for expanded functionality
+
+Editions
+--------
+
+Nextcloud Server is available in two editions:
+
+- **Community:** Community-supported (peer-to-peer help), 100% free.
+- **Enterprise:** Supported by core developers or authorized partners, with official packaging, extensive enterprise-specific documentation, and support options.
+
+*Both editions include all functionality and source code.*
+
+Enterprise editions can include deployment guidance, phone and email access to Nextcloud developers, official support for integrations and add-ons, custom branding, and extended support cycles, among other benefits.
+
+This guide primarily focuses on the Community edition, but the information applies to both editions.
+
+Further Resources
+-----------------
+
+- Video tutorials, overviews, and conference presentations: `Nextcloud YouTube channel <https://www.youtube.com/c/Nextcloud>`_.
+- Latest news and updates: `Nextcloud blog <https://nextcloud.com/news/>`_.
+- Community support: `Nextcloud Help Forum <https://help.nextcloud.com/>`_.
+- Commercial support: `Nextcloud GmbH <https://nextcloud.com/>`_.
+- Documentation: `Nextcloud Documentation <https://docs.nextcloud.com/>`_.
+
+Getting Started
+---------------
+
+To get started, see the Installation section.
+
+.. admonition:: Who develops Nextcloud?
+
+  The development of the Nextcloud platform is a cooperative
+  endeavor overseen by the core maintainers -- primarily
+  employed by Nextcloud GmbH -- along with thousands of
+  partners, providers, collaborators, project members, and 
+  community participants.
+
+  The Nextcloud community includes everyone -- from individual 
+  users and independent developers to large organizations.
+
+  Community members share and discuss their experiences with 
+  the platform every day. They suggest improvements, 
+  collaborate on design, write code, create documentation, 
+  test for bugs, triage bug reports and enhancement ideas, 
+  support others, improve translations, and help fund and 
+  organize the logistics of a project this size. Most 
+  importantly, they use Nextcloud in their daily lives and 
+  work.