To build PWA version for hosting on GitHub pages. The repo is set to host the
built version from the docs/ directory.
ionic cordova build browser
rm -rf docs/
cp -R platforms/browser/www docs
Use git status to check for changes.
Checkout any files you don't want to change, eg git checkout docs/manifest.json,
to reset back to the version in the repo.
Commit remaining files, then push to GitHub.