Modifies the static files to add Playwire branding and point to API doc

Note that this points to dev.phoenix.playwire.com for the moment.  It'll need
to be updated once the documentation is available in production.

In addition, these changes are just to the static output files; we'll need to
updated the source files when we get a chance.
Merge pull request #1 from intergi/feature/minimal-rebranding

Modifies the static files to add Playwire branding and point to API doc