Main screen

[johankool]

• [x] Show sectioned table view
• [x] Show icon/flag for Secure Internet entries
• [x] Have button add another organization
• [x] "Change Location" button
• [x] Support dark mode

Design issues:

• "Add Other Server" means to go to "Find your institute"? Perhaps a "+" button in the top left corner of the screen, or to the right side of the section headers would work better

[roop]

Fixed in #322.