chore: add announcements for 6.4.0

Author: webiny-bot

docs/release-notes/6.4.0/announcements/slack.md

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+Hello @channel! :wave:
+
+Webiny 6.4.0 is out! :rocket:
+
+This is a packed release with a few big additions. Webhooks are now in beta — you can subscribe to CMS and Website Builder events and trigger external endpoints when content changes, with full delivery history and retry support. We've also added an admin UI for monitoring background tasks, along with configurable retention settings to control how long task history is kept.
+
+The Website Builder got a nice visual refresh for the page editor, with improved drag previews, redesigned sidebars, and a more polished overall feel. We've also added Vue 3 and Nuxt support in preview if you're working outside the React ecosystem. On the AI side, the new personas and projects system lets you shape AI-generated content to match different brands or audiences. Check out the changelog to learn more.
+
+—
+
+As usual, the release notes can be found on the following links:point_down::skin-tone-2::
+Changelog: https://www.webiny.com/docs/release-notes/6.4.0/changelog
+How To Upgrade: https://www.webiny.com/docs/release-notes/6.4.0/upgrade-guide
+
+—
+
+Lots more coming soon — excited to see what you build with this one! :tada:

docs/release-notes/6.4.0/announcements/social.md

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+Webiny 6.4.0 is here 🚀
+
+This release introduces a complete webhooks system in beta, letting you trigger external HTTP endpoints when content changes in the CMS or Website Builder. You can subscribe to lifecycle events, inspect delivery history with full request/response payloads, and resend failed deliveries — all from the admin dashboard.
+
+The Website Builder page editor received a significant visual refresh with a redesigned drag preview, streamlined Style sidebar, and compact segmented controls. AI content generation now supports configurable personas and file-backed project contexts to shape tone and audience targeting across different brands. Vue 3 and Nuxt integration is also now available in preview, bringing Website Builder's document rendering and live editing capabilities to the Vue ecosystem.
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+Background tasks now have a dedicated admin interface for monitoring long-running operations, and you can configure how long completed task runs are retained. We'd love to hear how the new webhooks system works for your integration workflows.
+
+Changelog: https://www.webiny.com/docs/release-notes/6.4.0/changelog
+Upgrade guide: https://www.webiny.com/docs/release-notes/6.4.0/upgrade-guide

docs/release-notes/6.4.0/announcements/tweets.md

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+Curious how to make AI-generated content actually match your brand voice? Webiny 6.4.0 introduces AI Personas and Projects — define reusable style presets and file-backed context for consistent, audience-targeted content generation. 🎯
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+https://www.webiny.com/docs/release-notes/6.4.0/changelog
+
+---
+
+Editing a published page revision and accidentally overwriting live content is nerve-wracking. Website Builder now opens published revisions in read-only mode — only drafts are editable. Small change, fewer "oops" moments.
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+https://www.webiny.com/docs/release-notes/6.4.0/changelog
+
+---
+
+Webhooks are now in beta. Subscribe to CMS entry and page lifecycle events, trigger external HTTP endpoints when content changes, and inspect full request/response history — all from the admin dashboard.
+
+https://www.webiny.com/docs/release-notes/6.4.0/changelog
+
+---
+
+The page editor got a significant visual refresh in 6.4.0. New drag preview indicators, redesigned Style sidebar with consistent layout, cleaner element overlays, and compact segmented controls. Feels tighter to use.
+
+https://www.webiny.com/docs/release-notes/6.4.0/changelog