Editorial: convert to bikeshed

Steps to reproduce:

 * Convert fullscreen.bs by pasting into this one-off tool:
   https://gist.github.com/foolip/f60a1614fb5d194aad4dbff89c54ceb3
 * Manually finish conversion to Bikeshed, tweaking as needed to match
   the existing output as closely as possible.
 * Export top layer and its add/remove concepts for HTML.
 * Rewrap to 100 columns, taking care not to wrap inside elements.
 * Update README.md and remove Makefile.

Finally, to compare the new fullscreen.html with the old:

  for (var e of document.querySelectorAll('*')) {
    if (e.id)
      console.log('id: ' + e.id);
    if (e.hasAttribute('href') && e.className != 'self-link')
      console.log('href: ' + e.getAttribute('href'));
  }

Existing IDs/links affected:

 * #table-of-contents → #toc
 * #refsCSS → #biblio-css (and similar)
 * #anolis-references is gone

The old and new fullscreen.html were also copied from a browser into
plaintext and compared to verify no accidental differences. The biggest
differences are in the references section.

Fixes whatwg#47.

README.md

@@ -16,10 +16,18 @@ started, leave a comment on the issue or ask around [on IRC](https://wiki.whatwg
 ### Pull requests
 
 See the [html repository's README](https://github.com/whatwg/html/blob/master/README.md) for the
-general guidelines. Note that `source` is `Overview.src.html` and "Acknowledgements" is
-"Acknowledgments" here (I know). Also, the Fullscreen API Standard uses
-[Anolis](https://wiki.whatwg.org/wiki/Anolis) to generate `Overview.html`. (Do not worry if using
-that tool is too complicated, your pull request does not need to contain the generated HTML.)
+general guidelines.
+
+Please add your name to the Acknowledgments section in your first pull request, even for trivial
+fixes. The names are sorted lexicographically.
+
+To generate `fullscreen.html`, [bikeshed](https://github.com/tabatkins/bikeshed) can be used. Do not worry
+if using that tool is too complicated; your pull request does not need to contain the generated HTML
+to be accepted. If you _do_ want to use it, the easiest way is probably via the HTTP API:
+
+```
+curl https://api.csswg.org/bikeshed/ -f -F [email protected] > fullscreen.html
+```
 
 ### Merge policy