Navbar is updated to look more common.

Signed-off-by: Min Chen <minchnew@gmail.com>
Left panel is now collapsable.

Add a navUi directive to implement the link list in the left panel.

Signed-off-by: Min Chen <minchnew@gmail.com>
Left panel is done.

Each bridge is shown as a collapsable panel. Data is fetched on
opening the panel.

Signed-off-by: Min Chen <minchnew@gmail.com>