docs(whp): add reference + 5 add-on articles, env.d.ts for font CSS imports

src/content/docs/whp/reference/service-hostnames.mdx

@@ -0,0 +1,40 @@
+---
+title: Service hostnames
+description: Quick reference for connecting to MySQL, PostgreSQL, Memcached, Redis, and SMTP from inside your container.
+sidebar:
+  order: 1
+---
+
+import Hostnames from '~/content/partials/service-hostnames.mdx';
+import Support from '~/content/partials/support-link.mdx';
+
+Use these hostnames from inside your WHP container — they resolve to the internal services your site can talk to. They don't work from your laptop; see the note below.
+
+<Hostnames />
+
+## Where do I get credentials?
+
+Each service's credentials live in a different section of the WHP panel:
+
+- **MySQL** → **Databases → MySQL → Users**
+- **PostgreSQL** → **Databases → PostgreSQL** (if enabled on your plan)
+- **Redis** → **Caching → Redis**
+- **Memcached** — no auth required; the service is isolated per container.
+- **SMTP** — use any mailbox you've created and its password.
+
+## Connecting from your laptop
+
+Direct external connections to these internal services are not exposed for security reasons. Use the panel's tools instead:
+
+- **MySQL** — **phpMyAdmin** in the panel for ad-hoc queries.
+- **PostgreSQL** — **Adminer** in the panel.
+- **Redis / Memcached** — use the **Caching** section's built-in CLI panel.
+- **SSH tunneling** — if your plan includes SSH (see the plan page), you can tunnel from your laptop through your site container to the internal service.
+
+## Related
+
+- [Create a site](/whp/how-to/create-a-site/)
+
+## Still stuck?
+
+<Support />