Fix search input for latest version of Algolia

[LisaFC]

• Fixes New version of Algolia search breaks DOCSY search #845
• Closes Algolia Search: DocSearch API v3 doesn't seem to have 'inputSelector' any more #738

Preview: https://deploy-preview-985--docsydocs.netlify.app/docs/adding-content/navigation/#configure-algolia-docsearch

WIP, need to make sure docs instructions also apply to latest version.

[LisaFC]

Docs now done!

[LisaFC]

I've marked this as breaking as it will not work with Algolia DocSearch v2 - on the other hand, per #845 the old version of Algolia DocSearch doesn't work any more (v2 indexes are no longer being updated) so I'm not sure if it will make v2 users any more broken....

@chalin @geriom @emckean ideas for publicizing this? I presume we will have some v2 users who possibly haven't noticed their new content hasn't been indexed. Migration from v2 should be pretty trivial, I think the index name and search API key are the same, just the format of the snippet is different: https://docsearch.algolia.com/docs/migrating-from-v2

[LisaFC]

@chalin ready for review!

[chalin]

Thanks for the update. See inline comments.

Have you tested out the instructions?

[chalin]

@LisaFC - Oh, just remembered: as we discussed during the PSC meeting, could you add an entry to the CHANGELOG?

[LisaFC]

Yes, instructions tested, I added DocSearch to a test site here (using the Algolia site index): https://tender-beaver-c94732.netlify.app/

[chalin]

LGTM

Will you be adding to the CHANGELOG file via this or a separate PR?

[LisaFC]

I can add it in this PR - what format do we want, should we put it under a new 0.3.0 release?

[chalin]

put it under a new 0.3.0 release?

Yes.

[LisaFC]

Should I merge this now or do we need to do more release-y things?

[chalin]

Should I merge this now or do we need to do more release-y things?

Thanks for your patience. I wanted to adjust the CHANGELOG a bit. That's been done.