Add speed limiter button to toolbar

[HendricksJudy]

Fixes #112

Add a button to the toolbar for enabling and disabling the speed limiter.

• HomeComponent.kt

  • Add toggleSpeedLimiter function to handle the speed limiter toggle action.
  • Add speedLimiterAction to the headerActions list.

• Actions.kt

  • Add SpeedLimiterButton composable function to render the speed limiter button.

• HomePage.kt

  • Add SpeedLimiterButton to the TopBar composable function.
  • Add SpeedLimiterButton to the HomePage composable function.