Update CONTRIBUTING.md, replace wiki links

[Simek]

Summary

This PR is a follow up for the contributing content move on the website:

• Move the remaining RN wiki content to website react-native-website#3120

It replaces most of the CONTRIBUTING file content with a reference to the contributing overview page on the website, which has been based off the content of this file.

Additionally I have searched thought the code for the wiki links and replaces theme with the correct website links. There was an instance where comment was referring to an old and removed a while ago wiki page, so I just get rid of this link.

Changelog

[Internal] [Chore] - Update CONTRIBUTING.md, replace wiki links

Test Plan

N/A

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	7,823,968	+536
android	hermes	armeabi-v7a	7,210,836	+122
android	hermes	x86	8,134,534	+414
android	hermes	x86_64	8,114,765	+542
android	jsc	arm64-v8a	9,690,595	-141
android	jsc	armeabi-v7a	8,446,696	-137
android	jsc	x86	9,641,991	-136
android	jsc	x86_64	10,239,160	-134

Base commit: 79baca6
Branch: main

[facebook-github-bot]

@cortinico has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[react-native-bot]

This pull request was successfully merged by @Simek in 1999191.

^{When will my fix make it into a release? | Upcoming Releases}