Mra/feat getting started

[Mael-RABOT]

OP#69

• Refactor base modal component -> MovableModal
• New getting started guide

Guide:

data from docs/getting_started.md

New modals:

[Arcod7]

I just find the "Save Pose" modal useless to be honest
I think the button Save Pose should automatically put a name based on the timestamp, and that should be editable in "Load Pose" easily, the name of the pose should be a textfield.
Also in another ticket we can create default poses and then match with a k-NN the saved pose of the user with our default poses to find the nearest and find a more relevant name.