Motis Backports

[traines-source]

As discussed, backports from Motis UI.

• Added a simple backports.sh script to copy over reusable components from motis.
• Added rudimentary bottom navigation bar. Might add more generic improvements (datetime picking, modes, etc) in the coming days, if no one stops me :)

[felixguendling]

Sorry, I had to move the code over to motis-project/prima to deeply integrate with the existing SvelteKit backend. Otherwise, I would've to write APIs for everything and basically two applications. But I already copied most improvements you made there (next branch).

Might add more generic improvements (datetime picking, modes, etc) in the coming days, if no one stops me :)

Best would be if you add this to motis-project/motis/ui first (so also Transitous benefits). Also the features for via search and bike carriage in public transport would be nice to have in the advanced options of the web UI :)