Consistent mount points

[Istador]

The image should offer consistent mount points to be used by the users (especially the postgres mount point shouldn't change on upgrades).

• /data/database/ instead of /var/lib/postgresql/14/main/
• /data/tiles/ instead of /var/lib/mod_tile/
• /data/style/ instead of /home/renderer/src/openstreetmap-carto/
• /data/data.osm.pbf and /data/data.poly
• /data/flat_nodes.bin instead of /nodes/flat_nodes.bin (or even put them into /data/database/flat_nodes.bin, because it should never be separated from the database)

To do that the Dockerfile must create these directories and replace the current directories with symlinks (or change the configuration of the software using them).

This is a breaking change that requires a major version bump.