Add tools dropdowns, add more icons

• Add "page tools" and "user tools" dropdowns. They haven't been optimized for small screens yet, and any ideas of how to do that would be appreciated.
• Fix Echo formatting in header
• Change hover effect for links in dropdown trays
• Add view button and icon to the toolbox
• Add feed icon from Font Awesome (rss-square.svg from v 5.6.0 with viewbox resized to be square)
• Change layout to help with styling (minor)

Change-Id: Iac2ce56dc46aa34ed9134a5feb2e371491e380fa