Running list of small design improvements

[rdkelley]

• [ ] Event page header should be the same size as the page headers on the Sensor and Access pages and headers should begin at the same place horizontally between page changes
• [ ] Instead of yellow for sensors that haven’t reported in a while, change to a shade of gray to show that it may be offline, saving the yellow-ish hues for the quakes themselves

Mobile specific

• [x] Edit login page to fix animations on small screens
• [x] Hide left side nav when menu is inactive on small screens (currently, left side nav always shows)
• [x] Provide more space for events map on small screens
• [ ] Sensor table header doesn't have space for Interact
• [ ] "My sensor" tag on sensors page pushes info too far left on small screens