[FEATURE] Only use woff2 fonts where possible

[bengarrett]

Is your feature request related to a problem? Please describe.

For simplicity, RetroTxt uses the most suitable font type avaliable from the authors. Including, a large number of woff fonts that could be further compressed into woff2. Converting these fonts would reduce the overall package size of the Extension.

Describe the solution you'd like

There doesn't seem to be an easy way to convert woff into woff2. Rather, most tools only convert ttf to woff2. Confirm the source ttf are the same as the woff fonts, and the woff2 conversion to the build chain.

[bengarrett]

Added to v4.1.