These demos will work without a github token, but it is easy to exhaust the rate limit
without specifying a token. The demos will stop working when that happens. To use a
personal github token, enter it in the input below. It will be saved in session storage,
which goes away when you close your browser. Alternatively, you can add a
querystring parameter to specify your token on any of the examples like
?GITHUB_TOKEN=[yourtoken]