UI updates

• Make it possible and document how to add FacilMap as an app on smartphones
• Add description how style controlling and legend support works to the create/edit type dialog
• Add more marker shapes, for example rectangles, triangles, pentagons, hexagons and stars

Technical changes

• Fix support for the FacilMap server running under a sub-path
• Show descriptive errors in case the server is started without MAPBOX_TOKEN or ORS_TOKEN configured
• Render map name as part of static HTML so that search engines can pick it up better