Docs: landing page revamp (#8885)

* Docs: refresh landing page

* Docs: add landing page companion pages

* Docs: drop legacy Jekyll assets

* Docs: remove legacy terminal css test

* Docs: restore terminal css assets

* Docs: remove terminal css assets

docs/concepts/features.md

@@ -0,0 +1,53 @@
+---
+summary: "OpenClaw capabilities across channels, routing, media, and UX."
+read_when:
+  - You want a full list of what OpenClaw supports
+title: "Features"
+---
+
+## Highlights
+
+<Columns>
+  <Card title="Channels" icon="message-square">
+    WhatsApp, Telegram, Discord, and iMessage with a single Gateway.
+  </Card>
+  <Card title="Plugins" icon="plug">
+    Add Mattermost and more with extensions.
+  </Card>
+  <Card title="Routing" icon="route">
+    Multi-agent routing with isolated sessions.
+  </Card>
+  <Card title="Media" icon="image">
+    Images, audio, and documents in and out.
+  </Card>
+  <Card title="Apps and UI" icon="monitor">
+    Web Control UI and macOS companion app.
+  </Card>
+  <Card title="Mobile nodes" icon="smartphone">
+    iOS and Android nodes with Canvas support.
+  </Card>
+</Columns>
+
+## Full list
+
+- WhatsApp integration via WhatsApp Web (Baileys)
+- Telegram bot support (grammY)
+- Discord bot support (channels.discord.js)
+- Mattermost bot support (plugin)
+- iMessage integration via local imsg CLI (macOS)
+- Agent bridge for Pi in RPC mode with tool streaming
+- Streaming and chunking for long responses
+- Multi-agent routing for isolated sessions per workspace or sender
+- Subscription auth for Anthropic and OpenAI via OAuth
+- Sessions: direct chats collapse into shared `main`; groups are isolated
+- Group chat support with mention based activation
+- Media support for images, audio, and documents
+- Optional voice note transcription hook
+- WebChat and macOS menu bar app
+- iOS node with pairing and Canvas surface
+- Android node with pairing, Canvas, chat, and camera
+
+<Note>
+Legacy Claude, Codex, Gemini, and Opencode paths have been removed. Pi is the only
+coding agent path.
+</Note>