Setup of quarto docs

[gvegayon]

It sets up a GHA that:

• Installs poetry.
• Installs pyrenew.
• Sets up quarto.
• Renders all documents under model/docs/*.qmd

Eventually, this action could be used to generate the rst documents needed for the website. For the moment, is just a check that the documentation can properly render.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.80%. Comparing base (ca96421) to head (72d5bad).

❗ Current head 72d5bad differs from pull request most recent head b8ff399. Consider uploading reports for the commit b8ff399 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #59   +/-   ##
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  Coverage   89.80%   89.80%           
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  Files          26       26           
  Lines         559      559           
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  Hits          502      502           
  Misses         57       57           

Flag	Coverage Δ
unittests	89.80% <ø> (ø)

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[dylanhmorris]

I think this is good to go, but we should continue discussing https://github.com/CDCgov/multisignal-epi-inference/pull/59/files#r1552090213