NavBar Improvements

[bradenasmith2]

Tasks

• Enlarge the words
• Push the User (or Log In) to the far right
• Move the searchbar to the left side, just to the right of SceneSherpa
• Remove "Search" button until the user begins typing. Also here: #212

[bradenasmith2]

nav-link on the user's dropdown, and nav-item on an li inside of a navbar-nav ul. nested inside of the large div 'navbar-collapse collapse d....'