docs: add known extensions

[UziTech]

Description

Add a list of known extensions to the docs

Contributor

• no tests required for this PR.

Committer

In most cases, this should be a different person than the contributor.

• CI is green (no forced merge required).
• Squash and Merge PR following conventional commit guidelines.

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Name	Status	Preview	Updated
marked-website	✅ Ready (Inspect)	Visit Preview	Sep 20, 2022 at 0:47AM (UTC)

[calculuschild]

Should we add a small instruction for users who want to add their extension to the list?

Also, for the future, are we planning to just list any extension we come across or should there be some kind of criteria for "good" extensions?

[UziTech]

Should we add a small instruction for users who want to add their extension to the list?

I don't think we need any instructions other than to keep the list in alphabetical order, which I put in a comment above the list.

Also, for the future, are we planning to just list any extension we come across or should there be some kind of criteria for "good" extensions?

I think any extension that is maintained is good. If anyone wants to add or remove an extension they can create a PR.