Revert "geojson mimetype set elsewhere"
Revert "geojson mimetype set elsewhere"

This reverts commit 104d24c45c5767d20846642a3d78fb4c10530c09.

openheritage/open-plaques-3,openheritage/open-plaques-3,openheritage/open-plaques-3,openheritage/open-plaques-3