* Add support for Fathom Analytics
* Add myself to CONTRIBUTORS.md
* Set default for serverURL and check for siteID
* Update layouts/_default/baseof.html
Co-Authored-By: Luiz F. A. de Prá <luizdepra@users.noreply.github.com>
Co-authored-by: Luiz F. A. de Prá <luizdepra@users.noreply.github.com>