Dashboard: Added page descriptions.

Signed-off-by: matematik7 <domen.ipavec@z-v.si>
Dashboard: Show title and description in index.html.

Signed-off-by: matematik7 <domen.ipavec@z-v.si>
Dashboard: Added pinout images to GPIO.

Signed-off-by: matematik7 <domen.ipavec@z-v.si>
Dashboard: Fixed history select on mobile.

Signed-off-by: matematik7 <domen.ipavec@z-v.si>