Add alternate font that better supports a wider variety of characters

[ericras]

óⁿpʰoⁿ doesn't display correctly in Gotham.

https://umonhon.unl.edu/orthography has working examples using a different font.

[skoolbus39]

For reference, this is the font Loren is using on his site: https://software.sil.org/charis/

[boris1558]

For this pages purposes glyphs Unicode 02B0, 207F, 02C0 should appear as a similar weight/size. Also non-spacing diacritics Unicode 030C, 0323 need to be centered properly with the letter, many fonts centering fails on nonstandard consonants like x.