Added meta tags for homepage
Added meta description generator
Removed usages of <h1> (mkdocs-material doesn't reconize more than 1)
added space after # (markdown proper syntax)
removed pip3 command from pull request CI
Added mkdocs documentation.
Altered doxygen generation (doxyfile and shell script) to work with mkdocs.
Removed the whole html folder thing for docs, now the files reside in the root gh-pages branch.
New readme.
