feat: Add cli command to open documentation

[dipinknair]

usage: ansys-mechanical --docs

if this is a good idea, then I can do following in later or this PR.

• test
• Should it be different cli like ansys-mechanical-docs ?
• Docs

[codecov]

Codecov Report

Attention: Patch coverage is 44.44444% with 5 lines in your changes missing coverage. Please review.

Project coverage is 80.84%. Comparing base (3de0fb5) to head (0939f61).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #941      +/-   ##
==========================================
- Coverage   80.98%   80.84%   -0.15%     
==========================================
  Files          36       36              
  Lines        2272     2281       +9     
==========================================
+ Hits         1840     1844       +4     
- Misses        432      437       +5     

[RobPasMue]

Not a bad idea but... is it necessary to provide a CLI option to open the docs? In any case, my preference is ansys-mechanical --docs but I don't really know if this will be useful