Update documentation for Quarto Version

[yiranwu0]

Why are these changes needed?

Update documentation to install newer version of Quarto, and improve documentation for building website locally.

Related issue number

Closes #1925

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 ✅

Project coverage is 37.33%. Comparing base (4a85b63) to head (53d9850).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1951   +/-   ##
=======================================
  Coverage   37.33%   37.33%           
=======================================
  Files          64       64           
  Lines        6913     6913           
  Branches     1519     1519           
=======================================
  Hits         2581     2581           
  Misses       4109     4109           
  Partials      223      223           

Flag	Coverage Δ
unittests	37.33% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[jackgerrits]

Thanks!