Arrow Tofu #40

I'm getting tofu glyphs on the modfest site (here on https://modfest.net/pages/submissions) - it looks like U+1F844 and U+1F846 don't have very good font coverage.

Maybe they ought to be replaced with ← (U+2190) and → (U+2192) or provide a webfont that has those characters?

This is on Firefox on MacOS, which generally has pretty good coverage of glyphs in its default fonts, I assume it would also show like this on a Windows computer that doesn't have Noto fonts installed but I haven't checked.