Remove "Meetup" exercise from config.json

The "Meetup" exercise entry has been deleted, including its slug, name, uuid, practices, prerequisites, and difficulty level.

Author: Jegors Cemisovs

config.json

@@ -1493,17 +1493,6 @@
         ],
         "difficulty": 7
       },
-      {
-        "slug": "meetup",
-        "name": "Meetup",
-        "uuid": "602511d5-7e89-4def-b072-4dd311816810",
-        "practices": [],
-        "prerequisites": [
-          "datetime",
-          "enums"
-        ],
-        "difficulty": 7
-      },
       {
         "slug": "poker",
         "name": "Poker",