docs(signals): add Events page

[markostanimirovic]

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 #4777

What is the new behavior?

Documentation for the Events plugin has been added.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

[netlify]

✅ Deploy Preview for ngrx-io ready!

Name	Link
🔨 Latest commit	01d0085
🔍 Latest deploy log	https://app.netlify.com/projects/ngrx-io/deploys/68364fe65c13670008aa6c3f
😎 Deploy Preview	https://deploy-preview-4788--ngrx-io.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[netlify]

✅ Deploy Preview for ngrx-site-v19 ready!

Name	Link
🔨 Latest commit	01d0085
🔍 Latest deploy log	https://app.netlify.com/projects/ngrx-site-v19/deploys/68364fe64893d500085bf24b
😎 Deploy Preview	https://deploy-preview-4788--ngrx-site-v19.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[timdeschryver]

Nice!
Once all the PRs of the docs are merged, we'll have to update the new docs (in the wwwroot folder as well). I'll create an issue for this so we don't forget about it.

[rainerhahnekamp]

All good, I left one remark about the introduction.

@markostanimirovic you can ignore those suggestions about adding the to the headers if you don't want them for stylistic issues.

[rainerhahnekamp]

Let's go!