Document how tiles are created

[pnorman]

The only documentation on the website on how the tiles are generated is "Created with minjur and tippecanoe to create your own."

minjur has relatively few options, but tippecanoe has a lot

[sbma44]

worth adding zoomlevel to the site as well for tippecanoe users

[aaronlidman]

Sorry, I missed this ticket. I've been meaning to open source all the backend code, it's on my list.

For what it's worth here's the tippecanoe command:

tippecanoe \
    -t $DATADIR/tmp \
    -l osm -n osm-latest \
    -o $DATADIR/$LATEST.planet.mbtiles \
    -z12 -Z12 -ps -pf -pk -P -b0 -d20 \
    $DATADIR/$LATEST.geojson