feat: add official EmDash marketing template

- Marketing landing page with hero, features, testimonials, FAQ, pricing
- EmDash CMS with pages collection and marketing blocks
- Full seed data with all content sections
- Dockerfile with entrypoint for database persistence
- Responsive design with CSS variables

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

AGENTS.md

@@ -0,0 +1,28 @@
+This is an EmDash site -- a CMS built on Astro with a full admin UI.
+
+## Commands
+
+```bash
+npx emdash dev        # Start dev server (runs migrations, seeds, generates types)
+npx emdash types      # Regenerate TypeScript types from schema
+npx emdash seed seed/seed.json --validate  # Validate seed file
+```
+
+The admin UI is at `http://localhost:4321/_emdash/admin`.
+
+## Key Files
+
+| File                     | Purpose                                                                            |
+| ------------------------ | ---------------------------------------------------------------------------------- |
+| `astro.config.mjs`       | Astro config with `emdash()` integration, database, and storage                    |
+| `src/live.config.ts`     | EmDash loader registration (boilerplate -- don't modify)                           |
+| `seed/seed.json`         | Schema definition + demo content (collections, fields, taxonomies, menus, widgets) |
+| `emdash-env.d.ts`        | Generated types for collections (auto-regenerated on dev server start)             |
+| `src/layouts/Base.astro` | Base layout with EmDash wiring (menus, search, page contributions)                 |
+| `src/pages/`             | Astro pages -- all server-rendered                                                 |
+
+## Rules
+
+- All content pages must be server-rendered (`output: "server"`). No `getStaticPaths()` for CMS content.
+- `entry.id` is the slug (for URLs). `entry.data.id` is the database ULID (for API calls like `getEntryTerms`).
+- Always call `Astro.cache.set(cacheHint)` on pages that query content.