Include woff2 static files

[ryanhiebert]

The .woff2 fonts aren't being included in the release, and that's causing failures for my build using whitenoise.storage.CompressedManifestStaticFilesStorage, which looks for all referenced files from CSS files and compresses them with a static hash on the filename.

[ryanhiebert]

3.7.3 For some reason did include woff2 in the PyPI releases, but 3.7.4 does not. I'm not sure what changed between those releases as far as deploy process, and it's possible that this won't fix it, depending on the cause. It still seems like it should be included in the manifest, though.

[ryanhiebert]

I think that #5624 is the likely culprit, because before that the package data was given by a function in setup.py, rather than by looking at the MANIFEST.in. The woff2 file was the one that I was hitting, but I'm not yet sure that it's the only one that may have been lost by the change there.

[xordoquy]

Indeed that was working by unexpected side effect :(
I will try to ensure there are no other files forgotten elsewhere with drf.

[xordoquy]

closes #5692

[axnsan12]

*.ico seems to be missing too (static/rest_framework/docs/img/favicon.ico)

[tomchristie]

Thanks @ryanhiebert, @axnsan12.

Versions 3.7.5 & 3.7.6 now released. 🙃

[tomchristie]

I think we're clear now, right?
Shout out if anything's still borked.