Embedding fixes
Some fixes that occoured when the search-ui was embedded in the content-ui
- updated theme colors
- fixed homepage issue where the search-field is too short
- fixed date-icon error
- fixed leaflet-icons bug
to the leaflet icons bug: i'm not shure why dp.umwelt.info cannot display the icons. they were added as a custom background image where the image was displayed as a inline base64 svg. Now I changed the strategy: i add the svg via plain js (document.createElement). this is not as nice as the first approach, but i think this is the only option possible