* Set `MAX_ZOOM` to 7 by default.
* Remove `QUICKSTART_MIN/MAX_ZOOM` - unneeded complexity with two env vars. We can just use `MIN_ZOOM` and `MAX_ZOOM`. See also #261
* Generate dc-config yaml file with a new `make generate-dc-config` step. It will compute BBOX based on the downloaded data file. This step is not needed for planet generation.
* Generate Imposm replication file only when `DIFF_MODE` is `true`. Not needed otherwise. If the data source does not support it, it will throw an error.
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