Confusing README instructions about passing the public token

[jakubdrabik]

Right in the README, you're suggesting to pass the public token as --dart-define=ACCESS_TOKEN=ADD_YOUR_TOKEN_HERE, however, this is rather confusing since it's just related to your implementation example. ACCESS_TOKEN variable is not used anywhere under the hood of the library itself.

The README paragraph: https://github.com/flutter-mapbox-gl/maps#public-mapbox-access-token

This confusion was caused by this PR: https://github.com/flutter-mapbox-gl/maps/pull/760/files

cc @tobrun

[felix-ht]

feel free to open PR to fix it

[stale]

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