chore: move things around a little bit to the app plugin

Co-authored-by: Patrik Oldsberg <poldsberg@gmail.com>
Co-authored-by: Fredrik Adelöw <freben@users.noreply.github.com>
Co-authored-by: Johan Haals <johan@haals.se>
Co-authored-by: Camila Belo <camilaibs@users.noreply.github.com>
Co-authored-by: Camila Belo <camilaibs@gmail.com>
Signed-off-by: blam <ben@blam.sh>

plugins/app/package.json

@@ -35,6 +35,7 @@
   },
   "dependencies": {
     "@backstage/core-components": "workspace:^",
+    "@backstage/core-plugin-api": "workspace:^",
     "@backstage/frontend-plugin-api": "workspace:^",
     "@backstage/theme": "workspace:^",
     "@material-ui/core": "^4.9.13",
@@ -43,7 +44,8 @@
     "react-use": "^17.2.4"
   },
   "peerDependencies": {
-    "react": "^16.13.1 || ^17.0.0 || ^18.0.0"
+    "react": "^16.13.1 || ^17.0.0 || ^18.0.0",
+    "react-router-dom": "6.0.0-beta.0 || ^6.3.0"
   },
   "devDependencies": {
     "@backstage/cli": "workspace:^",