fix(14.3-01): ship http body limits in examples/hello

- add examples/hello/config/http.yaml so serve, route:list and
  TestTypedItemRoute work without a manual config step
- drop the matching setup step and known-issue notes from README.md and
  docs/setup/installation.md

README.md

@@ -38,15 +38,7 @@ The `migrate`, `migrate:status`, `migrate:rollback`, `serve` and admin commands
    CREATE DATABASE hello;
    ```
 
-2. Add the request body limits that `serve` and `route:list` require. The example does not ship them yet, and surf needs numeric values, which the string-valued environment overlay cannot supply. Create `config/http.yaml` in `examples/hello`:
-
-   ```yaml
-   body_limits:
-     default_bytes: 1048576
-     upload_bytes: 10485760
-   ```
-
-3. Point the binary at the database, give it an application key and an uploads bucket, then migrate and serve:
+2. Point the binary at the database, give it an application key and an uploads bucket, then migrate and serve:
 
    ```sh
    ./bin/hello key:generate      # prints a base64 key; copy the value
@@ -63,7 +55,6 @@ The `migrate`, `migrate:status`, `migrate:rollback`, `serve` and admin commands
 
 ### Known issues
 
-- `examples/hello` has no `http.body_limits` configuration, so `serve` and `route:list` fail with `surf: config http.body_limits.default_bytes is required` until you add it as in step 2. The same gap makes the example's `TestTypedItemRoute` fail.
 - The committed `examples/hello/main.go` is older than what `summer build` generates now, so building the example (or running its tests, which build it) leaves that file modified. Restore it with `git checkout -- examples/hello/main.go` if you do not intend to commit it.
 
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