Switched routing lib from bidi to reitit

This release jumps to 0.3 due to a "breaking" change. Reitit has a different route syntax from bidi, so you either need to change your routes or slightly tweak your config to keep working with bidi.

The switch to reitit is motivated by simplicity and user friendliness. Bidi is still a very good option, but Metosin is doing some excellent work on their libraries these days.