Metacat

Made some CSS changes to the "Go" button in the docs because it was off by a few pixels in three different browsers. Also changed the admin config landing page links to look like buttons

Imported FontAwesome after Bootstrap for the FontAwesome icons. Also added a white version of the metacat logo.

Matched the admin config pages to the default metacatUI theme. Changed the background image of the docs and config pages to a big cat for some metacat branding.

bring the "Go" button down one more pixel to align with the search field.

A few style changes to the docs

Added an ID and div wrapper to the docs html for more precise CSS selectors in the metacatui ExternalView.

Added a Sphinx theme for the documentation that mirrors the new default theme for MetacatUI.

https://projects.ecoinformatics.org/ecoinfo/issues/6075