feat: help centre article link placeholder

[iamacook]

What it solves

Adds help center link to the push notifications settings page.

How this PR fixes it

A new "Learn more about push notifications here" sentence has been added to the end of the description of push notifications in the per-Safe/global notifications settings.

How to test it

Open the per-Safe/global notifications settings and observe the new sentence/working link.

Screenshots

Checklist

• I've tested the branch on mobile 📱
• I've documented how it affects the analytics (if at all) 📊
• I've written a unit/e2e test for it (if applicable) 🧑‍💻

[github-actions]

Branch preview

✅ Deploy successful!

https://push_notification_link--walletweb.review-wallet-web.5afe.dev

[github-actions]

ESLint Summary View Full Report

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}

[francovenica]

Looks good. The link is both, in a safe settgins and the global preferences.

It takes to https://help.safe.global/en/articles/99197-how-to-start-receiving-web-push-notifications-in-the-web-wallet

Note: at the moment of writing this comment, the article still doesn't exist.