Create settings button for frontend

[tomjpandolfi]

• Language selection
• Dark mode
• RPC network selection
• Disability (colour blind mode)
• Ludicrous mode (enable beta / degen features) (blanked out for now)

[tomjpandolfi]

Examples: https://yearn.finance/#/settings https://spooky.fi/#/swap (find settings toggle top right) To be honest, there's no good example of this. It's just a modal that allows settings to be changed.

[tomjpandolfi]

View previous conversation around old UI - https://github.com/honey-labs/honey-frontend/pull/145