Add configuration for concept 'meetup' exercise

Updated `config.json` to include 'editor' paths for 'meetup' and adjusted `settings.gradle` to include the concept version while removing the practice version. This aligns with the intended migration from a practice exercise to a concept exercise.

Author: Jegors Cemisovs

exercises/concept/meetup/.meta/config.json

@@ -33,6 +33,9 @@
     "exemplar": [
       ".meta/src/reference/java/Meetup.java"
     ],
+    "editor": [
+      "src/main/java/MeetupSchedule.java"
+    ],
     "invalidator": [
       "build.gradle"
     ]

exercises/settings.gradle

@@ -16,6 +16,7 @@ include 'concept:karls-languages'
 include 'concept:lasagna'
 include 'concept:log-levels'
 include 'concept:logs-logs-logs'
+include 'concept:meetup'
 include 'concept:need-for-speed'
 include 'concept:remote-control-competition'
 include 'concept:salary-calculator'
@@ -91,7 +92,6 @@ include 'practice:markdown'
 include 'practice:matching-brackets'
 include 'practice:matrix'
 include 'practice:mazy-mice'
-include 'practice:meetup'
 include 'practice:micro-blog'
 include 'practice:minesweeper'
 include 'practice:nth-prime'