feat: added sphinx hook and mordern download buttons

[moe-ad]

Description

This pull request will close #490 and close #ansys-internal/pyansys-planning#96. The style of the download buttons on the example pages were improved and this was achieved by implementing a simple sphinx hook.

Checklist

• I have tested these changes locally.
• I have added necessary documentation or updated existing documentation.
• I have linked the issue(s) addressed by this PR if any.

[jorgepiloto]

Let's proceed this way for the moment. The best approach is to have all the logic within the conf.py. We can open an issue about it and address this in the future.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.45%. Comparing base (1231ec2) to head (79590b6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #500   +/-   ##
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  Coverage   92.45%   92.45%           
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  Files          64       64           
  Lines        2599     2599           
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  Hits         2403     2403           
  Misses        196      196           

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