Add a news story about the new motor controller

This news story is about both the new motor controller, as well as
showing off the fact that a whole bunch of volunteers in Oxford helped
out to make the cases etc.

Change-Id: Id274b7bc9d14ebebbf39756a11c767f1a4c718cb
Merge "Add a news story about the new motor controller"
Add basic mech docs skeleton with some content

Add basic mech doc and robot base tutorials skeleton, with some
content in a few pages.
Condense each mechanics section into its own page

The mechanics section was getting too large, so condense each one into a
single page. Also fix a broken image.
Fix a link and remove some irrelevant information

On the mechanics index, remove some irrelevant information and fix the
design considerations link.
Correct dimensions and links

Make a few minor corrections to dimensions and links.
Add tutorial for Lady Clarick, del images.

Add a tutorial for Lady Clarick, and delete all images that aren't used.
Fix copy/paste fail in Lady Clarick's description

There was a short one-line description at the top of this file which I'd
incorrectly copied from Anne de Breuil's description. Write a new one.
Add tutorial for Charlotte Backson.
Flesh out motor mounting steps, minor fixes.
Fix Charlotte Backson description