Fixed variable links in the StoryMap

* Now, variable/function links cause the passage to have the 'included
passage links' emblem instead of the broken links emblem. They also no
longer have the 'end passage' colour if they're they only kind of link
present.
* Fixed a HTML import bug where the passage immediately after the
StorySettings passage in the HTML storeArea wasn't being imported.
* Fixed some of Responsive's CSS.