[UX] first time user experience - removing Mapnik warnings about openmaptiles HOT 4 CLOSED

Based on https://wiki.openstreetmap.org/wiki/MinScaleDenominator amd mapnik/mapnik@219ad1f lots would need to be changed and tested to ensure it's ending up in the appropriate layer. But for now I think it should be left as is.

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at least, I will add a kindly warnings to the ./quickstart.sh - about this ...

echo "      : You will see a lot of deprecated warning in the log! This is normal!  "
echo "      :    like :  Mapnik LOG>  ... is deprecated and will be removed in Mapnik 4.x ... "

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Note to self, I think the scale_denominator = planet_meter_width/(tile_size x tiles_x_dir x standardized_pixel_size)

where planet_meter_width ~= 40075016.6855825 (need to confirm this number, might need trial and error)
tiles_x_dir = 2^zoom
standardized_pixel_size = 0.00028
tile_size = 512 (it's 512 pixels for Mapbox, 256 for common raster tiling)

Also see:
https://github.com/openstreetmap/mapnik-stylesheets/blob/master/zoom-to-scale.txt (256px tiles)
https://github.com/mapnik/mapnik/blob/master/src/scale_denominator.cpp

Open Question: How does this work for Retina, do you end up having to do an entirely different mbtiles for Retina as it's no longer zoom consistentt?

Plus, I don't think tilelive-copy even has support for scale_denominator yet.

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Deep dive results:

There would be a lot needed to avoid those messages, especially if we want to do more than hide them.

Basically, mapnik supports the scale_denominator args, but both tilelive and tilelive-mapnik don't seem to. I've done some experimenting here with adding support to tilelive-copy but it doesn't work as my arguments are being ignored due to the lack of support in tilelive and tilelive-mapnik. I think this is very far off, especially since v4 of Mapnik isn't even on the roadmap yet. So this is closed, especially with the warnings added by @ImreSamu to quickstart.sh.

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