Added serviceworker and web-manifest (#154)

* Added serviceworker and manifest.json

* added deps in package.json

* fixed image link

* actually fixed images i think

* added assets to individual module folders

* added caching

* Serviceworker now properly loads

* Changed single to double quotes

* Update lock

* moved the service worker back into prod only

* removed sw from general

* changed background color of splash screen

* added logo to server

* centralized logo into single assets folder