fix map self hosted

README.md

images/logos/ernst_von_siemens_kunststiftung.png

images/logos/kit.png

images/logos/kunst_auf_lager.png

images/logos/kunsthalle.png

images/logos/staedtische_galerie.png

images/logos/vg_kunst_bild.png

images/logos/zak.png

images/logos/zkm.png

js/map.js

tileserver/style-positron-local.json

tileserver/style-positron.json