Add breadcrumbs to documentation

[akaszynski]

This PR adds breadcrumbs to the documentation and changes the link of the PyAnsys logo to return to docs.pyansys.com. This is to remain consistent with the rest of the pyansys documentation (and industry in general) and provide a better experience when navigating through our documentation.

For an example of the rendered breadcrumb trail, see https://mapdldocs.pyansys.com/api/index.html

Note that the top level is always "PyAnsys" and the next level is the current project ("PyAEDT") followed by the sub-pages.

[codecov]

Codecov Report

Merging #945 (1989ae6) into main (9c1b223) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #945   +/-   ##
=======================================
  Coverage   80.31%   80.31%           
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  Files         128      128           
  Lines       37696    37696           
=======================================
  Hits        30276    30276           
  Misses       7420     7420