Implement dashboard for when you don't need to be looking at ROS messages

[dudebehinddude]

Currently the only information available are the ROS messages, and when you don't select a topic you get greeted with a blank console which isn't useful at all. This PR changes this by adding a dashboard page that will show some basic information about the robot.

The dashboard shows:

• Node health (node statistics)
• Current task (will need a topic to be subscribed to)
• Running time (can be done client side but ideally would happen again with a ROS topic
• Bigger emergency stop
• Another lil' guy (as requested by @c4glenn)

If there is more info that anyone thinks should be shown, add a comment to this PR and I'll see what I can do.

Tasks:

• Basic layout for the dashboard
• Listen to /hmi_start_stop in case start/stop is sent server-side
  • This should be what's needed to remove the stupid fake loading thing I added

Closes #10.

[dudebehinddude]

Huh I thought that last commit would fail tests, was too lazy to check LOL

[dudebehinddude]

removed some stuff that should be moved to a different pr, this should be decent as-is

[Hudson111-s]

LGTM!