Remove SendingAllowedChildrenNotification

[Luuk1983]

📋 Description

In Umbraco 16 (and 14 and 15) the SendingAllowedChildrenNotification no longer exists. Although the content of that page was updated to reflect the fact that it's no longer supported in Umbraco 16, after a conversion with Sofie it was decided that pages should be removed when a feature is no longer present in the CMS.

So this PR deleted this page and adds a redirect to it's replacement: content filters.

📎 Related Issues (if applicable)

Fixes #7332

✅ Contributor Checklist

I've followed the Umbraco Documentation Style Guide and can confirm that:

• Code blocks are correctly formatted.
• Sentences are short and clear (preferably under 25 words).
• Passive voice and first-person language (“we”, “I”) are avoided.
• Relevant pages are linked.
• All links work and point to the correct resources.
• Screenshots or diagrams are included if useful.
• Any code examples or instructions have been tested.
• Typos, broken links, and broken images are fixed.

Product & Version (if relevant)

Umbraco 16

Deadline (if relevant)

📚 Helpful Resources

• 🧾 Umbraco Contribution Guidelines
• ✍️ Umbraco Documentation Style Guide

[kjac]

Looks great to me! 💯

@sofietoft can you verify the redirect setup?

[sofietoft]

Changes look great, and the redirect checks out as well.