Avinash

Results 7 issues of Avinash

This PR is for issue [#172](https://github.com/redux-offline/redux-offline/issues/172). I have added test for reducers in updater.js

Adding an app shell would be really great. We can also cache it for the repeated user. I can start working on it if it's okay.

[Adding Back/Forward cache(BF cache)](https://web.dev/bfcache/) support will increase the page restore speed if the user navigates back using browser's back and forward button. For enabling BF cache we remove `unload` event...

In this PR i have refactored error strings to strings templated because i saw one error string repeating.

I was going through the code base and didn't saw any test. I can start with adding some unit tests and integration test as well.

Added meta tags for pages fixes #95

### Component/Part backend -> Database cofig ### Description This PR fixes #3063 ### Steps - [x] Added implementation - [ ] Added / updated tests - [x] Added / updated...

type: feature enhancement