Make sure remaining issues are solved

[sourishkrout]

• Are redirects complete?
• The Getting Started content under /getting-started/vscode is really old - perhaps edit it down to what's relevant and put the Quickstart guide at the top?
• Badges are gone, i.e. no more Runme frontmatter in the docs. This is okay, if the document itself is not runnable.

[sourishkrout]

We still have some breakages, @admc just based on docs-internal links: https://gist.github.com/sourishkrout/3aafc2adef2be9e116ceea109a9bdcb4#file-01j7pa862dk2gm1v5gcxexzv1s-md