Remove duplicate notice on project#show

Signed-off-by: Max Fierke <max@maxfierke.com>
Change events#show page `Cancel` button appearance for consistency.

Signed-off-by: Max Fierke <max@maxfierke.com>
Update navbar to use fixed-width icons, add shield icon for `Admin` link

Signed-off-by: Max Fierke <max@maxfierke.com>
Add missing </div> in users#show template

Signed-off-by: Max Fierke <max@maxfierke.com>
Remove extraneous <hr />

Signed-off-by: Max Fierke <max@maxfierke.com>