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