Add Reddit bot intro guide

docs/introduction/intro-reddit-bots.mdx

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+import IntroTilePanel from '@site/src/components/IntroPagesFeatures/IntroTilePanel.js';
+import Rocket from '@site/docs/assets/introduction/SpotIllustration_Rocket.webp';
+import SnooToolboxClipboard from '@site/docs/assets/introduction/SnooToolboxClipboard.webp';
+
+# Reddit Bots on Reddit
+
+Build bots that respond to community activity and run inside subreddit installations without managing your own server.
+
+Devvit is Reddit's developer platform for building interactive, cross-platform tools and apps that run natively on Reddit.
+
+## Why build Reddit bots with Devvit?
+
+Reddit bots can help communities automate workflows, keep discussions organized, and respond to events as they happen.
+
+- React to posts and comments with triggers
+- Store community-specific state with Redis
+- Let moderators configure behavior per subreddit
+
+## Get started
+
+<IntroTilePanel
+  tiles={[
+    {
+      title: 'Quickstart',
+      image: Rocket,
+      background: 'linear-gradient(135deg, #b2f7ef 0%, #4be18a 100%)',
+      textColor: '#003820',
+      imageSide: 'left',
+      textAlign: 'left',
+      alt: 'Quickstart',
+    },
+    {
+      title: 'Migration Guide',
+      image: SnooToolboxClipboard,
+      background: 'linear-gradient(135deg, #ffe066 0%, #ff7c53 100%)',
+      textColor: '#5a2a00',
+      imageSide: 'right',
+      textAlign: 'left',
+      alt: 'Migration Guide',
+    },
+  ]}
+>
+  [Quickstart](../quickstart/quickstart-reddit-bot.md)
+  [Migration Guide](../guides/migrate/public-api.md)
+</IntroTilePanel>
+
+<hr style={{ margin: '2.5rem 0', border: 'none', borderTop: '2px solid #eee' }} />
+
+## Community
+
+Have questions or want to share your bot? Join [r/devvit](https://www.reddit.com/r/devvit/) or our [Discord](https://developers.reddit.com/discord) to connect with other developers, get feedback, and show off your creations.