Update NgRx Integration example

[timdeschryver]

• Links pointing to the docs website
• Update implementation to complement new NgRx versions

[zalmoxisus]

Thanks! Do you know if Book Collection demo link specified there and in README is up to date? According to #589 (comment) it wasn't.

Would be great to provide a demo so we could probably add it in e2e tests in future to avoid regressions. I guess after Redux, NgRx is the most popular library using our extension, so it would deserve some tests.

[timdeschryver]

We got a new example at https://ngrx.github.io/platform/example-app/#/login but requires a login (username: test, password: doesn't matter). That's why I've left the old example app. I do agree that it would be better to have the new one, I'll add an extra commit with these changes.

[zalmoxisus]

@timdeschryver looks like the new demo has some issues using the extension. Nothing appears on the extension's side.

[timdeschryver]

🤦‍♂️ you're right, thanks for noticing it!
The example app is also already a year old. Give me some time and I'll see what I can do in order to have the example app updated, with the extension on 😄

[zalmoxisus]

Take your time, thanks for working on that 😀

[zalmoxisus]

Thanks again for the contribution! I've started a complete rewrite of the extension for 3.0, then will add proper e2e tests for ngrx.

[timdeschryver]

Sounds great!