Currently API keys are at different places in the code:

• https://github.com/OpenPlaceGuide/osmapp/blob/opg-master/src/components/Directions/routing/getGraphhopperResults.ts#L7-L7
• https://github.com/OpenPlaceGuide/osmapp/blob/opg-master/src/components/LayerSwitcher/osmappLayers.tsx#L103-L103

and so on ...

I think we should centralize them in an env-file and add a note, that forks should use own keys - best along with a note where to sign up for each API key type.
Also it might make sense to limit those keys to a referrer?

Or is it okay, to use those keys for forks?