Make custom content more template-based

- Moved custom CSS and Bootstrap JS from the default.aspx file into the
JohnsonFerryFluidLayout.ascx Template.
- Added code to make the Bootstrap dropdown menus activate on hover
rather than click. This was done via CSS, using media query to make sure
the hover action only takes place when the navbar is not collapsed
(i.e.: when viewed on a smartphone).
- Altered JS that customizes the login controls so that it only affects
the controls within the navbar.
- Modified the JF logo position and style.