Setup docs and demo hosting

[levithomason]

Currently, the repo is used to host on gh-pages. This is causing pains by having to ignore dist files, then force add them on the CI process. The master branch then can't be branched for features as it includes ignored files in git cache. We have to maintain an integration branch.

If we setup s3 hosting for instance, we can then simply push deploys there instead and ignore them in the repo.