Add link to document pinning blog posts

[guimachiavelli]

Fixes #2517

[github-actions]

All broken links are now fixed, thank you!

[Strift]

Two piece of feedback on my end:

• It's best if we can make it so searching for "Document boosting" brings results, otherwise I fear user might not find it
• I tend to see both guides as a workaround for the same issue; one backend implementation, and one frontend implementation. Both have downsides/limitations. I'm not sure this is conveyed by the current wording.

[guimachiavelli]

Hi, @Strift!

Responding:

It's best if we can make it so searching for "Document boosting" brings results, otherwise I fear user might not find it

Agreed, which is why I'm using both document boosting and pinning in both blocks. I can invert their usage order so "boosting" is on the <Capsule> title if you prefer, but this will have no impact on search results in our search bar. I still think both "pinning" and "boosting" should be present to cover both ways of referring to this feature/technique.

FYI, the docs scraper runs on the main branch, so the search bar will only reflect changes in this PR after it has been merged.

I tend to see both guides as a workaround for the same issue; one backend implementation, and one frontend implementation. Both have downsides/limitations. I'm not sure this is conveyed by the current wording.

Done. If that's the angle we're going for, I'd suggest making it explicit in the blog posts' intro too.