docs: Use author field for Sphinx

[stotko]

Previously, the author field was not used such that this information was provided in the copyright field. With the more recent versions of Sphinx and other related libraries, the author field became mandatory. Use it to avoid the default "Author not set" text.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.34%. Comparing base (d57a490) to head (c7edd04).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #430      +/-   ##
==========================================
- Coverage   97.42%   97.34%   -0.08%     
==========================================
  Files          32       32              
  Lines        2524     2524              
==========================================
- Hits         2459     2457       -2     
- Misses         65       67       +2     

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