move nav bar to left side and implement hover animations,
generalize color scheme using css variables,
move button and btn-group related styles to buttons.css,
consolidate form input and select styles in form.css
Signed-off-by: Arthur Lu <learthurgo@gmail.com>
add confirm message on start/stop,
change power action from shutdown to stop,
improve action button alt texts
Signed-off-by: Arthur Lu <learthurgo@gmail.com>