Announce current page on sidebar links, version

[peterychang]

Why are these changes needed?

Fixes Screen Reader issue (58)

Related issue number

#5631

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.71%. Comparing base (ecdb74b) to head (cf63f08).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5986   +/-   ##
=======================================
  Coverage   76.71%   76.71%           
=======================================
  Files         191      191           
  Lines       13191    13191           
=======================================
  Hits        10119    10119           
  Misses       3072     3072           

Flag	Coverage Δ
unittests	76.71% <ø> (ø)

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[peterychang]

Actually, the version dropdown should be using aria-selected=true instead of aria-current

[ekzhu]

Actually, the version dropdown should be using aria-selected=true instead of aria-current

Should we include changing the dropdown class in this PR?

[peterychang]

Actually, the version dropdown should be using aria-selected=true instead of aria-current

Should we include changing the dropdown class in this PR?

Yeah, I thought of this after I logged off for the day yesterday. I just got on long enough to note it down