Return to default MkDocs fonts

This removes "Tahoma" as the text font and reverts to the default
Material for MkDocs font, which seems to be a lot more readable. Not
sure why Tahoma was there.

Author: nadimkobeissi

mkdocs.yml

@@ -21,9 +21,6 @@ theme:
       toggle:
         icon: material/brightness-4
         name: Switch to light mode
-  font:
-    text: Tahoma
-    code: roboto
   language: en
   favicon: img/favicon.ico
   logo: img/logo.png