Expand navbar clickability

Changed the Javascript for the Login "on click". Now if you click anywhere within the ``<li>`` element the modal will appear, instead of just the "Login" text. Since they look like buttons I thought this might make more sense. Would like to add this to the Logout link as well, but since that's an actual link and doesn't use JS, we'll have to mess around with that to make it work.

Other quick changes:
* Realigned some lines of the CSS
* Changed the color of the "Logout" link to white to match Settings and Login.