Remove navigation bar from comments view.
Cleanup .less source.
Make page routing a little more generic in listing components.

Step 1 to making it a single-page app.
Fix deeply nested children getting out of alignment when selected.
Add single App component and loading screen.

Step 2 in making this a single page app.
Increase flattened-tree line thickness.
Remove min-height on body.
Remove margin change when deselecting root element.