Upgrade Quarto and use notebook metadata for frontmatter

[jackgerrits]

Why are these changes needed?

• Metadata based front matter is way less error prone and easier to consume
• This should also fix a number of notebook rendering issues that were happening. Thanks Quarto team for the really fast fix! (Can the number of backticks used for Jupyter notebook code cell be specified? quarto-dev/quarto-cli#8919)

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.

[ekzhu]

Once this is merged can you send an update to the #documentation discord channel to announce the usage? and document-contributor role.

[jackgerrits]

Certainly

[qingyun-wu]

Fixing some typos. I also have confusion about the referred yaml in the sentence "Ensure the first cell is markdown and before absolutely anything else include the following yaml within a comment." Otherwise, look good!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.69%. Comparing base (97923ee) to head (c0a8251).

Additional details and impacted files

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##             main    #1836   +/-   ##
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  Coverage   35.69%   35.69%           
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  Files          63       63           
  Lines        6625     6625           
  Branches     1454     1454           
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  Hits         2365     2365           
  Misses       4067     4067           
  Partials      193      193           

Flag	Coverage Δ
unittests	35.69% <ø> (ø)

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