docs: update README table badges to gh-pages SVGs (#805)
docs: update README table badges to gh-pages SVGs (#805)

Fixes #804

(At least, I hope so!)

Hosting directly from GitHub while getting caching right is a bit tricky, but it
looks like GitHub pages has nicer response headers so that the content type is
correct and the cache expiration is relatively short.
decaffeinate/decaffeinate,eventualbuddha/decaffeinate,eventualbuddha/decaffeinate,alangpierce/decaffeinate,alangpierce/decaffeinate,alangpierce/decaffeinate,decaffeinate/decaffeinate