Restyle landing to match aimloperations.com and use piha.lc.

Public short hosts are piha.lc (prod) and beta.piha.li (beta). The root
page is a marketing CTA to contact AI ML Operations for access.
Closes #3.

API.md

@@ -3,13 +3,13 @@
 For other services (`monica_site`, later callers) that mint short links.
 
 This service has two public hostnames. **Call the API host.** Never create links
-on the short domain (`aiml.pw` / `cidinn.li` / `go.mkdrealtor.com`). That host
+on the short domain (`piha.lc` / `beta.piha.li`). That host
 only serves `GET /` (landing) and `GET /<code>` (302). `/api/` there is **404**.
 
 | Host | Example | What you call |
 |------|---------|----------------|
 | API | `https://shortener.aimloperations.com` | `POST/GET /api/links/` |
-| Short | `https://aiml.pw` (or `cidinn.li`) | phones only — `GET /<code>` |
+| Short | `https://piha.lc` (beta: `https://beta.piha.li`) | phones only — `GET /<code>` |
 
 Local compose: API + redirects on `http://127.0.0.1:8005`.
 
@@ -147,7 +147,7 @@ Content-Type: application/json
 ```json
 {
   "code": "a3k9xm",
-  "short_url": "https://aiml.pw/a3k9xm",
+  "short_url": "https://piha.lc/a3k9xm",
   "target_url": "https://mkdrealtor.com/listings/oak-st?utm_source=monica&utm_medium=sms",
   "title": "Oak St listing",
   "is_active": true,