Convert site to a single JavaScript archive

* Convert build to use a single JavaScript file on the site (instead
  of downloading each library separately). This also means that all
  global variables (e.g., `$` for JQuery, `_` for Underscore.js) can
  be removed.
* Remove unused scripts and/or move them to a more appropriate repo
* Update the `deploy` script to work with CircleCI's automation
* Update markdown display code to allow images to be located with the
  markdown data files instead of the pre-rendered index pages

circle.yml

@@ -0,0 +1,9 @@
+deployment:
+    staging:
+        branch: master
+        commands:
+            - ./scripts/deploy --staging
+    production:
+        branch: production
+        commands:
+            - ./scripts/deploy --production