Switch from tldraw to drawio

[TaylerUva]

Drawio is more industry standard (used at my work), less extension version dependent, and can be viewed on GitHub without export.

1. Create a new folder design
2. Create a new files called motors_and_states.drawio.svg, buttons.drawio.svg, state_transitions.drawio.svg
3. Contents should be identical to robot.tldr
4. Delete robot.tldr
5. Add hediet.vscode-drawio to extensions.json
6. Remove tldraw-org.tldraw-vscode and bierner.markdown-mermaid from extensions.json