[FL-2481] Renamed assets->resources; enforcing Manifest build if it does not exist (#1135)

* Renamed assets->resources; enforcing Manifest build if it does not exist
* Rebuild resources from CI
* Added Manifest to repo - be sure to rebuild it with `make -C assets` before committing changes!
* Actually added Manifest.
* Keeping Manifest on assets clean
* Spelling fix in Makefile

.github/workflows/build.yml

@@ -76,7 +76,7 @@ jobs:
         with:
           run: |
             set -e
-            make assets_manifest
+            make assets_rebuild assets_manifest
             git diff --quiet || ( echo "Assets recompilation required."; exit 255 )
 
       - name: 'Build the firmware in docker'