Use openfreemap tiles by default

[tintou]

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Is your feature request related to a problem? Please describe.
Currently, maps is using openstreetmap tiles which comes with a cost for the openstreetmap community, we also don't have HiDPI tiles there

Describe the solution you'd like
We should default to https://openfreemap.org/

Describe alternatives you've considered
Nne

Additional context

Using our public instance is completely free: there are no limits on the number of map views or requests. There’s no registration, no user database, no API keys, and no cookies. We aim to cover the running costs of our public instance through donations.

It would be great to adapt the credit to add them then.