Remove ax dependency from tutorials

[saitcakmak]

Updates BoTorch tutorials to remove dependency on Ax.

• Custom BoTorch model w/ Ax tutorial is removed. We have another custom model tutorial that covers the non-Ax subject.
• Custom acquisition tutorial is updated to remove Ax parts and moved to bite-sized tutorials.
• Tutorials index page is updated to point to the Ax tutorial that is being added in Add MBM tutorial facebook/Ax#3722. The link will not work until Ax 1.0 is released.
• Ax dependency is removed from setup.py and the GHA workflows are updated to remove Ax related blocks.

New tutorial landing page:

Custom acquisition tutorial:

[facebook-github-bot]

@saitcakmak has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (ed2e5c0) to head (95ff4c3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #2839   +/-   ##
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  Coverage   100.00%   100.00%           
=========================================
  Files          211       211           
  Lines        19320     19320           
=========================================
  Hits         19320     19320           

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[facebook-github-bot]

@saitcakmak merged this pull request in 1d4e14a.