fixed overflow handling when transitioning from intro to dashboard; changed text selection color @ login to better fit the theme

Video table improvements

See merge request !16

moved bulk action buttons to the top and merged them with the search field, fused them with the table; filtering now happens on keystroke

Login rework 2

See merge request !15

Profile

See merge request !14

finished account deletion client-side, user now gets logged out after deleting their account, but the message is still shown, added passowrd reset form clearing, optimized login route.