docs: update and simplify all documentation (#39686)

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

docs/_coverpage.md

@@ -4,9 +4,9 @@
 
 ## Here are some quick and fun ways you can help the community.
 
-- <span class='cover-icon' style="color: #002ead;"><i class="far fa-question-circle"></i></span> [Help by answering coding questions](https://forum.freecodecamp.org/c/help?max_posts=1) on our community forum.
-- <span class='cover-icon' style="color: #00471b;"><i class="far fa-comments"></i></span> [Give feedback on coding projects](https://forum.freecodecamp.org/c/project-feedback?max_posts=1) built by campers.
-- <span class='cover-icon' style="color: #c4302b;"><i class="fab fa-youtube"></i></span> [Help us add subtitles (closed captions)](https://www.youtube.com/timedtext_cs_panel?c=UC8butISFwT-Wl7EV0hUK0BQ&tab=2) to our YouTube channel videos.
-- <span class='cover-icon' style="color: #000000;"><i class="fab fa-github"></i></span> [Contribute to our open source codebase](/index?id=our-open-source-codebase) on GitHub.
+- <span class='cover-icon'><i class="fas fa-question-circle"></i></span> [Help by answering coding questions](https://forum.freecodecamp.org/c/help?max_posts=1) on our community forum.
+- <span class='cover-icon'><i class="fas fa-comments"></i></span> [Give feedback on coding projects](https://forum.freecodecamp.org/c/project-feedback?max_posts=1) built by campers.
+- <span class='cover-icon'><i class="fas fa-language"></i></span> [Help us add subtitles (closed captions)](https://www.youtube.com/timedtext_cs_panel?c=UC8butISFwT-Wl7EV0hUK0BQ&tab=2) to our YouTube channel videos.
+- <span class='cover-icon'><i class="fab fa-github"></i></span> [Contribute to our open source codebase](/index?id=our-open-source-codebase) on GitHub.
 
 [Read our contributing guidelines](/index.md)