Create a settings modal, including language options, light mode toggle, accent colour pick

[BowTiedHeron]

Assigned to tinybigideas

[FlacoJones]

A bounty has been minted for this issue at https://app.openq.dev/bounty/I_kwDOHB1JPc5L_6Cm/0x86E4dd3449919800B0317cf2Bb3073EbF6B41079

[tinybigideas]

Wahey! 🙌