bootloaders: reorganise installer menu entries

per layout from MR #199 discussion.

under "Advanced install options" we have:
  - Graphical installer
  - Text installer
  - Graphical installer with dark theme
  - Text installer with dark theme
  - Installer with speech synthesis

under each of these we have a set of:
  - Install
  - Expert install
  - Automated install
  - Rescue mode

note that the 'automated' entries are moved up before the 'rescue' entries.

for hotkeys, the four entries above have hotkeys of 'i', 'x', 'a', and 'r'
respectively. ('x' is used instead of 'e' to avoid clash with standard
grub hotkey). this means that some entries that previous had no hotkeys
due to the flat list now have them. the other big difference is the main
graphical install entry going from 'g' to 'i' for consistency and the main
speech synth entry going from 's' to 'i' for the same reason.

furthermore, in the level above we have 'g' for normal graphical, 't' for
normal text install, 's' for speech synth, 'd' for graphical dark mode,
and 'k' for text dark mode.

the text-only sets are identical to the graphical ones except only for
dropping the graphical groups, simplifying maintenance, bringing clarity
to users of images (who may not have even made the image) that the set is
text-only, and keeping consistent hotkeys between graphical and text-only.

a 'start installer with speech synthesis' entry shortcut has been placed
at the top menu level alongside the 'start installer' shortcut.

Gbp-Dch: Short

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