fix markdown links and Mustache Tag Replacement

[CollinBeczak]

Resolves: #2763

test instructions:

Test Mustache Tag Replacement

Problem A - Markdown links with mustache tags:

• OSM Link
• TILDA Link

Problem B - Bare URLs from mustache tags:

• OSM: {{osm_link}}
• TILDA: {{tilda_link}}

Control - Hardcoded links (should always work):

• Hardcoded Link
• https://www.openstreetmap.org/way/1119390131

test.geojson:

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "geometry": {
        "type": "Point",
        "coordinates": [13.4129161, 52.546675999]
      },
      "properties": {
        "osm_link": "https://www.openstreetmap.org/way/1119390131",
        "tilda_link": "https://tilda-geo.de/regionen/infravelo?map=18.8/52.546675999/13.4129161&config=l6jzgk.5ount5.4&v=2&bg=areal2025-summer",
        "mapillary_link": "https://www.mapillary.com/app/?lat=52.546675999&lng=13.4129161&z=18.8&panos=true",
        "street": "Schönhauser Allee"
      }
    }
  ]
}

before:

after: