Admin UI/UX Auth Enhancements

[lane711]

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Now that we have auth integrated, we can make some minor UI/UX enhancements using the bootstrap admin theme.

1. remove email from left nav
2. remove Logout from left nav
3. remove search input from top header (I don't think we're going to implement any kind of global search any time soon)
4. Add currently logged in user First Name + Last Name
5. Add a logout icon and link it to the logout endpoint (same as what what removed in number 2 above)
6. use a logout icon from the library of icons that is already being used (bootstrap icons)