Add July 2025 updates for Slack app integration (#969)

Author: skeptrunedev

changelog.mdx

@@ -5,6 +5,17 @@ rss: true
 noindex: true
 ---
 
+<Update label="July 2025" rss={{ title: "July Product Updates", description: "Slack app integration with zero friction access and contextual answers" }}>
+  ## Slack app
+
+  - Zero friction access: Bot responds to DMs, @mentions, and any question in your `#ask-ai` channel
+  - One-click setup: Install directly from your Mintlify dashboard in seconds
+  - Contextual answers: Searches your entire documentation to provide relevant, accurate responses
+  - Deflect support interruptions: Turn daily questions into instant, self-serve answers
+
+  Learn more in our [Slack app guide](/ai/slack-app).
+</Update>
+
 <Update label="June 2025" rss={{ title: "June Product Updates", description: "AI assistant updates and subscribable changelogs" }}>
   ## AI assistant updates