docs: update and simplify all documentation (#39686)

Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>

docs/_sidebar.md

@@ -1,18 +1,27 @@
-- **<i class="fas fa-hourglass-start"></i> Getting Started**
+- **Getting Started**
   - [Introduction](/index.md 'Contribute to the freeCodeCamp.org Community')
-- **<i class="fas fa-code"></i> Code Contribution**
-  - [Work on coding challenges](/how-to-work-on-coding-challenges.md)
-  - [Help with video challenges](/how-to-help-with-video-challenges.md)
-  - [Set up freeCodeCamp locally](/how-to-setup-freecodecamp-locally.md)
+  - [Frequently Asked Questions](/FAQ.md)
+- **Code Contribution**
+- - [Set up freeCodeCamp locally](/how-to-setup-freecodecamp-locally.md)
   - [Open a pull request](/how-to-open-a-pull-request.md)
+  - [Work on coding challenges](/how-to-work-on-coding-challenges.md)
+  - [Work on video challenges](/how-to-help-with-video-challenges.md)
   - [Work on the news theme](/how-to-work-on-the-news-theme.md)
   - [Work on the docs theme](/how-to-work-on-the-docs-theme.md)
+- **Optional Guides**
   - [Catch outgoing emails locally](/how-to-catch-outgoing-emails-locally.md)
-  - [Set up WSL](/how-to-setup-wsl.md)
+  - [Set up freeCodeCamp on WSL](/how-to-setup-wsl.md)
 
 ---
 
-- **<i class="fas fa-plane"></i> Flight Manuals** (for Staff & Mods)
+- **中文社区贡献指南**
+  - [成为专栏作者](/i18n/chinese/news-author-application.md)
+  - [文章翻译计划](/i18n/chinese/news-translations.md)
+  - [视频翻译计划](/i18n/chinese/video-translations.md)
+
+---
+
+- **Flight Manuals** (for Staff & Mods)
   - [Moderator Handbook](/flight-manuals/moderator-handbook.md)
   - [Reply Templates](/flight-manuals/using-reply-templates.md)
   - [DevOps Overview](/devops.md)
@@ -20,14 +29,7 @@
 
 ---
 
-- **<i class="fas fa-language"></i> 中文社区贡献指南**
-  - [成为专栏作者](/chinese-guides/news-author-application.md)
-  - [文章翻译计划](/chinese-guides/news-translations.md)
-  - [视频翻译计划](/chinese-guides/video-translations.md)
-
----
-
-- **<i class="fas fa-user-friends"></i> Our Community**
-  - [**<i class="fab fa-github"></i> GitHub Repository**](https://github.com/freecodecamp/freecodecamp)
-  - [**<i class="fab fa-discourse"></i> Contributors category on Forum**](https://freecodecamp.org/forum/c/contributors)
-  - [**<i class="fab fa-gitter"></i> Contributors chat room on Gitter**](https://gitter.im/FreeCodeCamp/Contributors)
+- **Our Community**
+  - [**GitHub**](https://github.com/freecodecamp/freecodecamp)
+  - [**Discourse Forum**](https://freecodecamp.org/forum/c/contributors)
+  - [**Gitter Chat**](https://gitter.im/FreeCodeCamp/Contributors)