Move Webhooks and Custom Content sections to dedicated docs

docs/content.md

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+# Custom Content
+
+The web dashboard supports custom content including markdown pages and media files. Content is served from the `CONTENT_HOME` directory (default: `./content`).
+
+## Directory Structure
+
+```
+content/
+├── pages/     # Custom markdown pages
+│   └── about.md
+└── media/     # Custom media files
+    └── images/
+        ├── logo.svg          # Full-color custom logo (default)
+        └── logo-invert.svg   # Monochrome custom logo (darkened in light mode)
+```
+
+## Custom Logos
+
+The web dashboard supports custom logo images placed in `media/images/`:
+
+- `logo.svg` — full-color logo, displayed as-is in both themes (no automatic darkening)
+- `logo-invert.svg` — monochrome/two-tone logo, automatically darkened in light mode for visibility
+
+If no custom logos are provided, the default MeshCore Hub logos are used.
+
+## Markdown Pages
+
+Custom pages are written in Markdown with optional YAML frontmatter for metadata. Pages automatically appear in the navigation menu and sitemap.
+
+### Setup
+
+```bash
+# Create content directory structure
+mkdir -p content/pages content/media
+
+# Create a custom page
+cat > content/pages/about.md << 'EOF'
+---
+title: About Us
+slug: about
+menu_order: 10
+---
+
+# About Our Network
+
+Welcome to our MeshCore mesh network!
+
+## Getting Started
+
+1. Get a compatible LoRa device
+2. Flash MeshCore firmware
+3. Configure your radio settings
+EOF
+```
+
+### Frontmatter Fields
+
+Pages use YAML frontmatter for metadata:
+
+```markdown
+---
+title: About Us        # Browser tab title and nav link (not rendered on page)
+slug: about            # URL path (default: filename without .md)
+menu_order: 10         # Nav sort order (default: 100, lower = earlier)
+---
+
+# About Our Network
+
+Markdown content here (include your own heading)...
+```
+
+| Field | Default | Description |
+|-------|---------|-------------|
+| `title` | Filename titlecased | Browser tab title and navigation link text (not rendered on page) |
+| `slug` | Filename without `.md` | URL path (e.g., `about` → `/pages/about`) |
+| `menu_order` | `100` | Sort order in navigation (lower = earlier) |
+
+The markdown content is rendered as-is, so include your own `# Heading` if desired.
+
+## Docker Configuration
+
+With Docker, mount the content directory as a read-only volume. This is already configured in `docker-compose.yml`:
+
+```yaml
+volumes:
+  - ${CONTENT_HOME:-./content}:/content:ro
+environment:
+  - CONTENT_HOME=/content
+```
+
+To customize the content path, set `CONTENT_HOME` in your `.env` file:
+
+```bash
+# .env
+CONTENT_HOME=./content
+```