Tidy up HTML/CSS/JS

[pastokes]

The HTML, CSS and JS are fairly messy at the moment, with a lot of ad hoc hacks, so these should be restructured and tidied up, removing redundant classes and complying more closely with BootStrap structure. The Collection and Annotator pages also rely very heavily on JS, including HTML and inline styles all on client side; these should also be tidied up by creating a proper Django template and moving appropriate content there. Controls should also be abstracted properly, not built ad hoc by JS as they are now.