Updated maps on map preview pages.
Added Dynamic Vector Tile (from PostGIS) previews.
Merge branch 'master_nopg' of https://github.com/spatialdev/PGRestAPI into master_nopg

# By DD
# Via DD
* 'master_nopg' of https://github.com/spatialdev/PGRestAPI:
  update

RW - Reverted changes.