docs: Add Tags documentation for Contact management

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Creates comprehensive documentation for Tags in Mautic. The new tags.rst page covers creating and managing Tags, adding Tags to Contacts manually and via batch updates, using Tags in Campaigns (Modify Contact's Tags action, Contact Tags condition), using Tags in Forms and Segments, Tag search syntax, and best practices for Tag taxonomy.

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Web UI: Can you check if there is any missing documentation

Agent Response

I've completed a comprehensive review of the Mautic documentation and identified three key documentation gaps. I've created documentation suggestions to address each one:

Summary of Documentation Gaps Found and Addressed

1. Tags Documentation (New Page) ✅

Gap Found: Tags are used throughout Mautic (Campaigns, Forms, Segments) but there was no dedicated documentation explaining what Tags are or how to use them.

Created: New docs/contacts/tags.rst covering:

• What Tags are and how they differ from Segments
• Creating and managing Tags
• Using Tags in Campaigns (Modify Contact's Tags action, Contact Tags condition)
• Using Tags in Forms
• Using Tags as Segment filters
• Tag search syntax
• Best practices for Tag taxonomy

2. Webhooks Documentation (New Page) ✅

Gap Found: Webhooks are mentioned in cron jobs and settings, but there was no documentation explaining how to actually create and configure Webhooks.

Created: New docs/configuration/webhooks.rst covering:

• Creating and configuring Webhooks
• All available Webhook events (Contact, Email, Form, Page)
• Example JSON payload structure
• Global Webhook settings and queue mode
• Cron job setup for queued Webhooks
• Troubleshooting common issues
• Performance and security considerations

3. A/B Testing Documentation (Enhanced Section) ✅

Gap Found: A/B testing was only briefly mentioned in the Emails documentation (just about previewing variants), with no comprehensive guide.

Enhanced: Added comprehensive A/B testing section to docs/channels/emails.rst covering:

• Step-by-step setup instructions
• What elements to test (subject lines, sender name, content, images, CTAs)
• How to analyze A/B test results
• Best practices for effective testing

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Features That Were Already Well Documented

My review also confirmed these areas are adequately documented:

• Point Groups, Event cloning, Export permissions, Custom fonts in GrapesJS
• SAML/SSO authentication, Do Not Contact

...truncated. See dashboard for full response.

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Citation: Referenced Modify Contact's tags action and Contact Tags condition from the Campaign Builder documentation to ensure consistency in describing Tags usage within Campaigns.
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Citation: Referenced the Modify Contact's Tags Form action documentation to ensure consistency in describing Tags usage within Forms.
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