doc: enhance search bar experience by using pymeilisearch

[jorgepiloto]

This pull-request enables PyMeilisearch. This tool enhances the user experience when using the search bar.

In ansys/pyfluent@fdf78e4 the option is enabled in the HTML theme configuration.

Later, in a754f43 and b7dc66c, the documentation gets indexed.

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[codecov]

Codecov Report

Merging #2368 (2483d81) into main (d9e48f4) will decrease coverage by 0.06%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2368      +/-   ##
==========================================
- Coverage   87.67%   87.61%   -0.06%     
==========================================
  Files          45       45              
  Lines        8527     8527              
==========================================
- Hits         7476     7471       -5     
- Misses       1051     1056       +5     

[jorgepiloto]

Codecov Report

Merging #2368 (b7dc66c) into main (d9e48f4) will decrease coverage by 6.01%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2368      +/-   ##
==========================================
- Coverage   87.67%   81.66%   -6.01%     
==========================================
  Files          45       45              
  Lines        8527     8527              
==========================================
- Hits         7476     6964     -512     
- Misses       1051     1563     +512     

It looks like the coverage is considering the conf.py file... This should not be this way.

[germa89]

LGTM! Thank you!