Update gh-pages for components

[justincy]

The Polymer ecosystem has moved to having your docs publish at webcomponents.org which works great for the docs but our demos don't run well there because of requiring OAuth. We previously published our own docs on gh-pages, as was the norm with Polymer v1 but there are no longer tools available to do that in v2 (though I think we could use the deprecated v1 tools). Either way, we ought to update the docs.

See https://github.com/Polymer/polymer-cli/issues/808 and https://github.com/Polymer/polymer-cli/pull/653

[justincy]

Maybe use https://github.com/PolymerLabs/indie-catalog

[justincy]

The indie-catalog is working pretty well. It's our best option but it will take a bit of work:

• [x] Customize the title and colors
• [x] Update element demos to set the fs-client token-cookie-path property to /
• [x] Add a Sign In button to the header
• [x] List all elements
• [x] Add/remove/update demos
• [x] Push to gh-pages
• [x] Remove docs published to individual element gh-pages

[justincy]

I can't figure out why the gh pages deploy isn't detecting changes.

[justincy]

https://fs-webcomponents.github.io/indie-catalog/

Not perfect but it's still pretty good