refactor: nambahin role mentor di admin account dan ngeremove max_member di project

prisma/schema.prisma

@@ -207,7 +207,6 @@ model Project {
     description  String        @db.Text
     start_date   DateTime      @db.Date
     end_date     DateTime      @db.Date
-    max_members  Int           @default(8)
     status       ProjectStatus @default(active)
     created_at   DateTime      @default(now())
     updated_at   DateTime      @updatedAt
@@ -277,6 +276,7 @@ model TaskSubmission {
 
 enum Role {
     admin
+    mentor
     intern
 }