I have a huge vector on the right, but {⍺,⍺} ignores the right argument entirely, and just catenates the left argument with itself, returning a 2-item vector.
In order to serve the font(s) from the repo, all you have to do is make sure the .ttf files are in the _static folder. E.g., my APL385.ttf file can be seen here.
@xpqz the font saga has come to a close. See my custom.css file for the CSS I'm using to style the book with APL385 (thanks Adám!). To check it is working, you can visit, for example, this link.