Support for github gists

[justjxke]

Exactly what the title says, right now we don't have support for github gists as far as i know.

[kunaaal13]

@ping-maxwell is there any design system / figma we follow? I can take this up

[justjxke]

Remember to also add it to the extension's redirects.

[justjxke]

@kunaaal13 I didn't realize but there is actually already an open PR for this. #293