Headers and footers for scaladoc generation, including version in HTML

[eavilaes]

The current version of scaladoc (sbt unidoc) generates HTML documents like the one in the screenshot below. My idea is to include in these some information about the qbeast-spark version, both in the header and the footer of the files:

Any suggestions or modifications are more than welcome!☺️

[codecov-commenter]

Codecov Report

Merging #90 (02f33ee) into main (86c6481) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #90   +/-   ##
=======================================
  Coverage   89.34%   89.34%           
=======================================
  Files          60       60           
  Lines        1286     1286           
  Branches      100      100           
=======================================
  Hits         1149     1149           
  Misses        137      137           

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[osopardo1]

Header is 🔝

I don't know if for the footer is necessary to include the GitHub link. Did you inspire by other projects? In any case, seems good!

[eavilaes]

Header is 🔝

I don't know if for the footer is necessary to include the GitHub link. Did you inspire by other projects? In any case, seems good!

As there's no reference or link to the project in the docs, I thought it was great to have it. But I agree it looks kinda weird🙃