added MR-Bid to supporters (#375)

new administration added to supporters list

Reviewed-on: https://git.fsfe.org/pmpc/website/pulls/375
Co-authored-by: bonnie <bonnie@fsfe.org>
Co-committed-by: bonnie <bonnie@fsfe.org>

site/data/organisations/organisations.json

@@ -825,6 +825,15 @@
     "priority": "1",
     "url": "https://www.laquadrature.net"
   },
+  
+  {
+    "name": "Landkreis Marburg-Biedenkopf",
+    "img": "Mr-Bid.png",
+    "orgtype": "administration",
+    "priority": "1",
+    "url": "https://www.marburg-biedenkopf.de/"
+  },
+  
   {
     "name": "LibreITALIA",
     "img": "libreitalia.png",
@@ -916,6 +925,7 @@
     "priority": "0",
     "url": "https://www.mageia.org/en/"
   },
+  
   {
     "name": "mediale pfade",
     "img": "medialepfade.png",