update readme to add note on required Quarto Version. Update readme t…

[victordibia]

Update readme to add note on required Quarto Version.
Add note on Docusaurus 3.0 support

Why are these changes needed?

Add note on Quarto 1.4+ requirement for local development of website.

Related issue number

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation 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-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b10e065) 33.14% compared to head (f0e06f5) 33.14%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1493   +/-   ##
=======================================
  Coverage   33.14%   33.14%           
=======================================
  Files          42       42           
  Lines        5039     5039           
  Branches     1153     1153           
=======================================
  Hits         1670     1670           
  Misses       3241     3241           
  Partials      128      128           

Flag	Coverage Δ
unittests	33.10% <ø> (ø)

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