build: clean up package.json

- Remove non-existing homepage
- Make package versions fixed

package.json

@@ -2,7 +2,6 @@
   "name": "@openstapps/app",
   "version": "0.0.1",
   "description": "The generic app tailored to fulfill needs of German universities, written using Ionic Framework.",
-  "homepage": "https://stapps.innocampus.tu-berlin.de/",
   "license": "GPL-3.0-only",
   "author": "Karl-Philipp Wulfert <krlwlfrt@gmail.com>",
   "contributors": [
@@ -69,10 +68,10 @@
     "core-js": "2.6.5",
     "deepmerge": "3.3.0",
     "form-data": "2.5.0",
-    "moment": "^2.29.1",
+    "moment": "2.29.1",
     "ngx-logger": "4.1.9",
     "ngx-markdown": "9.1.1",
-    "ngx-moment": "^5.0.0",
+    "ngx-moment": "5.0.0",
     "rxjs": "6.6.3",
     "tslib": "1.14.1",
     "zone.js": "0.11.2"