docs: update example app to standalone

[sheikalthaf]

Updated the example app to standalone, removed all the modules from app.

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngrx/platform/blob/main/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[x] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Closes #

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

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[timdeschryver]

Thanks for your work on this @sheikalthaf .
I left a few comments for some details.

Can you also take a look at the pipeline, it currently has some failing tests and ESLint issues.
For more details see https://github.com/ngrx/platform/pull/4487/checks?check_run_id=28492422455

[rainerhahnekamp]

Hey, looks like we have a duplicate for this: #4417. Was there a second issue, or should I assign @sheikalthaf to it?

[brandonroberts]

@rainerhahnekamp it was assigned to you, so you still have first choice.

[rainerhahnekamp]

@sheikalthaf, please keep in mind the contribution guide (https://github.com/ngrx/platform/blob/main/CONTRIBUTING.md).

We usually open an issue and assign it to you. Only then should you submit a PR. Otherwise, multiple developers will be working on the same task.

In this case, I am going to assign the issue to you, but please check the issues first for the next one.

Please add a short comment in #4417, so that I can select you from the user list.

Thanks!

[sheikalthaf]

@rainerhahnekamp thanks for pointing out. sorry I don't know about that. From next time I'll check the issue comments clearly. Sorry for the confusion here.

[timdeschryver]

Woops, sorry @rainerhahnekamp I missed that during my initial review.

[sheikalthaf]

@timdeschryver this is the only testcase is failing and i see that the snapshot is wrong. Can you help me here

[sheikalthaf]

@rainerhahnekamp and me going to work together on this PR. For now I'm making this as a Draft until the pipeline is fixed.
@rainerhahnekamp currently linting is failing, can you help me here.

@timdeschryver FYI

[rainerhahnekamp]

@sheikalthaf yup, I will check