Add routes to stream cameras

Uses the camera configurations in config.json to setup routes to stream
camera video only. Camera control will be added later, possibly
elsewhere.
Change index page title
Video viewport in index page

Currently hardcoded to cam1/feed, but I'll make it dynamic in time.

This change also includes css to wrap the img's containing div tightly
to the img. Infuriatingly, the div's computed size is 5px taller than
the img height. Adding a -5px bottom marging to the image fixes this,
thought it's a little hacky.
Buttons elements to control camera pan/tilt

The buttons are really transparent divs overlayed on the video feed
image. The become more opaque when hovered over.

No functionality yet, just the elements.