feat: publish a cheat sheet via github pages

[jcjaskula-aws]

Issue #, if available:

A cheat sheet is a good way to browse the BDK API to find quickly which functions to use.

Description of changes:

This PR:

• adds the source for a cheat sheet based on jekyll.
• adds a CI action that build and publish the cheat sheet on github pages
• adds a script that goes through all the sections of the cheat sheet and create a single markdown file to feed genAI agent
  • it uses html comments to optimize the cheat sheet (adding additional information that we might not want to publish in the cheat sheet to keep it clean)
  • it adds the markdown file at the root of the website and can be vended via url/genAI_optimized_cheat_sheet.md

Testing done:

N/A

Merge Checklist

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• [x] I have read the CONTRIBUTING doc
• [x] I used the commit message format described in CONTRIBUTING
• [x] I have updated any necessary documentation, including READMEs and API docs (if appropriate)

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (d5dfbf4) to head (1127b8d). Report is 4 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #995 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 135 135 Lines 8919 8941 +22 Branches 2002 2008 +6 ========================================= + Hits 8919 8941 +22 ```

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