fix: Serive worker cache issues

[v-almonacid]

This PR addresses two separate issues, possibly related.

• A caching issue in the service worker when a file is too big, in which case its caching is handled by the browser. It may occur then that the browser removes this file from the cache, causing the current issue on zetta.
• OTOH there is the old cache issue where index.html refers to a stale index.xxx.js file. Working on the other issue I realized we need to be much more conservative and add zero caching on our index.html.

[faraggi]

great we have this now.
I assume this fixes a few of our white page errors