Build keyboard edition component
Goal: allow a user to edit a single (default) keyboard, on a pre-defined grid (3 lines by 6 columns )
User stories:
- View the keyboard to modify, each position is a clickable button (or zone)
- When clicked, display the details of the glyph on the right side
- A button allows to pick another character, under the details of the glyph
Do not implement grid resizing here