Synthesise results and create a public roadmap for accessibility enhancements

[trallard]

Description 📝

Now that @frankelavsky has almost completed the initial round of accessibility audits, we should look into clustering and summarising the findings.

This will help us to identify priorities, remediation work needed, and put together a roadmap that will be shared with the Bokeh community.

[trallard]

I discussed the next steps with @pavithraes and @frankelavsky this week, so they will be working on summarising the findings and breaking them into recommendations/work items 🚀

[frankelavsky]

I've laid out an outline of the summary doc in PR 22 over at the audit. I'll likely need one or two more work days to finish this. Ideally the docs site is finished too (has annotations page as well as our not-applicable folders) so that I can drop absolute link paths to our evidence when I'm citing things in the findings.

As far as my month goes, I might only get 1 more day to work on this next week (if that). So I might finish this work between the 28th and the 31st once I am back from vacation (but haven't yet left for my second one). I hope that is okay!