request: Option for custom CSS

[mdlaat]

I don´t believe there currently is an option for adding custom css to fava.

Would it be possible to make available an option like: 1998-01-01 custom "fava-option" "customcss" "/path/to/custom.css"

which would inject <link rel="stylesheet" href="/path/to/custom.css" /> into the html that fava produces?