Add Meetup Darmstadt (#32)

* Add Meetup Darmstadt

* Update content/meetups.json

Co-authored-by: d11n <mail@dennisreimann.de>

content/meetups.json

@@ -135,6 +135,14 @@
     "country": "DE",
     "state": ["Hessen"]
   },
+  {
+    "name": "Einundzwanzig Darmstadt",
+    "url": "https://t.me/einundzwanzigda",
+    "top": 53,
+    "left": 26,
+    "country": "DE",
+    "state": ["Hessen"]
+  },
   {
     "name": "Einundzwanzig Mainz",
     "url": "https://t.me/joinchat/kgdKrjL58C1lOTAy",
@@ -294,7 +302,7 @@
     "left": 19,
     "country": "CH",
     "state": ["Basel"]
-  },  
+  },
   {
     "name": "Bitcoin Bern",
     "url": "https://www.meetup.com/de-DE/bitcoin-bern/events/",