docs(local-dev): add 'Local development' section + PHP 8.5 support

Adds /whp/local-dev/ with three articles documenting the public cloud
container images on repo.anhonesthost.net/cloud-hosting-platform/:

- overview: dev/prod parity pitch, prerequisites, table of images,
  link to the Gitea org, and a note that this is for customers
  comfortable with Docker (the hosted side needs none of this).
- php-apache: cloud-apache-container (cac). PHP 7.4 through 8.5 side
  by side, default 8.3, AlmaLinux 9 + Apache mod_ssl. Documents
  image tags, local-dev.sh flags, manual docker command, bind-mount
  layout, WordPress install, helper scripts (instance_start /
  instance_stop / instance_logs / instance_db_info), and cleanup.
- node: cloud-node-container (cnoc). Node 18/20/22, default 20,
  AlmaLinux 9 + Nginx (SSL + HTTP→HTTPS redirect) + PM2 +
  Memcached. Same shape: tags, flags, manual docker, where code
  goes (user/app/), logs layout, helpers, cleanup.

Sidebar gains a 'Local development' group between Site Builder and
Reference. Section redirect /whp/local-dev/ -> overview added to
the section-landing redirect set.

src/content/docs/whp/local-dev/php-apache.mdx

@@ -0,0 +1,155 @@
+---
+title: PHP + Apache locally
+description: Run the cloud-apache-container image on your laptop for WordPress and other PHP apps.
+sidebar:
+  order: 2
+---
+
+import { Steps, Aside } from '@astrojs/starlight/components';
+import Support from '~/content/partials/support-link.mdx';
+
+[`cloud-apache-container`](https://repo.anhonesthost.net/cloud-hosting-platform/cloud-apache-container) (image: **`cac`**) is the same Apache + PHP image we use for hosted PHP sites. It's based on **AlmaLinux 9**, ships with **PHP 7.4, 8.0, 8.1, 8.2, 8.3, 8.4, and 8.5** side-by-side (default 8.3), and uses **Apache with mod_ssl**.
+
+## Image tags
+
+Pre-built tags are pushed on every change:
+
+- `cac:latest` — the default (PHP 8.3).
+- `cac:php74`, `cac:php80`, `cac:php81`, `cac:php82`, `cac:php83`, `cac:php84`, `cac:php85` — pin to a specific PHP version.
+
+Pull from `repo.anhonesthost.net/cloud-hosting-platform/cac:<tag>`.
+
+## Quick start with `local-dev.sh`
+
+The repo ships a `local-dev.sh` script that handles the Docker incantation, creates the volume + log directories, generates helper scripts, and installs a fresh WordPress in the web root.
+
+<Steps>
+
+1. Clone the repo and `cd` in:
+
+   ```bash
+   git clone https://repo.anhonesthost.net/cloud-hosting-platform/cloud-apache-container.git
+   cd cloud-apache-container
+   ```
+
+2. Start a local instance:
+
+   ```bash
+   ./local-dev.sh -n local-dev
+   ```
+
+3. The script will:
+   - Create a user directory and log folders (`apache/`, `system/`).
+   - Create a Docker volume for MySQL.
+   - Start the container with the right env vars.
+   - Generate helper scripts in your root path (`instance_start`, `instance_stop`, `instance_logs`, `instance_db_info`).
+   - Install WordPress in your web root.
+   - Print the MySQL credentials it generated.
+
+4. Open `http://localhost/` in a browser — WordPress's setup screen should be there.
+
+</Steps>
+
+## Flags
+
+| Flag | Purpose | Default |
+|---|---|---|
+| `-n` | Container name (required) | — |
+| `-p` | HTTP port | `80` |
+| `-s` | HTTPS port | `443` |
+| `-r` | Root path for files and DB | current directory |
+| `-a` | PHP version (`74`, `80`, `81`, `82`, `83`, `84`, `85`) | `83` |
+| `-v` | Verbose mode | off |
+| `-h` | Show help | — |
+
+Example — run a PHP 8.5 instance on port 8080:
+
+```bash
+./local-dev.sh -n my-php85-site -a 85 -p 8080 -s 8443
+```
+
+## Manual Docker usage
+
+If you'd rather skip the script and run it yourself:
+
+```bash
+mkdir -p local-development/domain.tld
+cd local-development/domain.tld
+mkdir user
+mkdir -p user/logs/{apache,system}
+
+docker run -d -it \
+  -p 80:80 -p 443:443 \
+  -e PHPVER=84 -e environment=DEV \
+  --mount type=bind,source="$(pwd)"/user,target=/home/myuser \
+  -v"$name-mysql":/var/lib/mysql \
+  -e uid=30001 -e user=myuser -e domain=localhost \
+  --name local-dev \
+  repo.anhonesthost.net/cloud-hosting-platform/cac:latest
+```
+
+## Get a shell inside the container
+
+```bash
+docker exec -it local-dev /bin/bash
+```
+
+Useful for running `wp-cli`, tailing logs from inside, or checking PHP modules.
+
+## Where things live
+
+| Inside the container | On your laptop (via bind mount) |
+|---|---|
+| `/home/myuser/public_html/` — Apache docroot | `local-development/domain.tld/user/public_html/` |
+| `/home/myuser/logs/apache/` — Apache logs | `local-development/domain.tld/user/logs/apache/` |
+| `/var/lib/mysql/` — MySQL data | Named Docker volume (`<name>-mysql`) |
+| `/home/myuser/mysql_creds` | Same path on the bind mount |
+
+## WordPress
+
+`local-dev.sh` installs WordPress automatically. If you started manually:
+
+```bash
+docker exec -it local-dev bash
+cat /home/myuser/mysql_creds  # see the credentials
+cd /home/myuser/public_html
+wp core download
+wp config create --dbname=... --dbuser=... --dbpass=... --dbhost=localhost
+wp core install --url=http://localhost --title="Local Dev" --admin_user=admin --admin_email=you@example.com
+```
+
+## Stop / start / clean up
+
+The helper scripts the local-dev script writes are the easy path:
+
+```bash
+./instance_stop      # stop the container
+./instance_start     # start it again
+./instance_logs      # tail Apache logs
+./instance_db_info   # show MySQL credentials
+```
+
+To wipe everything:
+
+```bash
+docker rm -f local-dev
+docker volume rm local-dev-mysql
+rm -rf local-development/
+```
+
+<Aside type="tip">
+  Want to test the exact PHP version of your hosted WHP site locally? Match the `-a` flag to your site's PHP version on the [Sites page](/whp/how-to/create-a-site/).
+</Aside>
+
+## Source
+
+[`cloud-apache-container` on Gitea](https://repo.anhonesthost.net/cloud-hosting-platform/cloud-apache-container) — Dockerfile, entrypoint, build configs, and the `local-dev.sh` script.
+
+## Related
+
+- [Node + Nginx locally](/whp/local-dev/node/)
+- [Create a site](/whp/how-to/create-a-site/) — the hosted side.
+
+## Still stuck?
+
+<Support />