refactor: rename all the router files and removed the Router their names

Author: IIvexII

src/routes/GCRouter.js renamed to src/routes/GoogleCalendar.js

@@ -1,7 +1,7 @@
-const GCRouter = require('./GCRouter');
-const TimetableRouter = require('./TimetableRouter');
-const PopulateRouter = require('./PopulateRouter');
-const RoomRouter = require('./RoomRouter');
+const GCRouter = require('./GoogleCalendar');
+const TimetableRouter = require('./Timetable');
+const PopulateRouter = require('./Populate');
+const RoomRouter = require('./Room');
 
 module.exports = {
   GCRouter,