Remove focus

Refs https://gitlab.com/arkindex/requests/-/issues/700

The transcription focus now breaks several things on the interface (keyboard shortcuts, on long pages the display "jumps"). Also transcription is not as important now that we have Callico.

Let's remove the default focus on transcription when a user lands on a page. The keyboard shortcuts should be available immediately, and the display should not move when there are long transcriptions / classifications zones.

This is not blocking for 1.3.0