Honest copy: remove backup claims, fix Hetzner redirects, add .env security

- WordPress README: remove 'backups automatizado' claim
- All READMEs: honest descriptions matching website landing pages
- Replace Hetzner/Contabo affiliate links (broken/placeholder) with Vultr/DigitalOcean (active)
- Fix /precios/ → /packs/ URL (404 redirect)
- WordPress compose: require .env for passwords, no insecure defaults
- Add .env.example template
- INSTALL.md: updated with honest copy and Vultr/DO links
- All deploy.sh banners: updated to match new honest copy

wordpress/docker-compose.yml

@@ -1,5 +1,5 @@
-# d0a1 pack — WordPress Agéntico
-# Tu WordPress con IA local conectada. Posts SEO, moderación, backups — automatizado.
+# d0a1 pack — WordPress + IA
+# Tu WordPress con IA local. Genera borradores, modera comentarios.
 #
 # Local:  ./deploy.sh local    → http://localhost:8080
 # VPS:    ./deploy.sh vps      → http://TU_IP:8080
@@ -14,10 +14,10 @@ services:
     volumes:
       - wp_db:/var/lib/mysql
     environment:
-      MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD:-d0a1root}
+      MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD:?Set MYSQL_ROOT_PASSWORD in .env}
       MYSQL_DATABASE: wordpress
       MYSQL_USER: wordpress
-      MYSQL_PASSWORD: ${MYSQL_PASSWORD:-d0a1pass}
+      MYSQL_PASSWORD: ${MYSQL_PASSWORD:?Set MYSQL_PASSWORD in .env}
     healthcheck:
       test: ["CMD", "healthcheck.sh", "--connect", "--innodb_initialized"]
       interval: 15s
@@ -37,7 +37,7 @@ services:
       WORDPRESS_DB_HOST: db:3306
       WORDPRESS_DB_NAME: wordpress
       WORDPRESS_DB_USER: wordpress
-      WORDPRESS_DB_PASSWORD: ${MYSQL_PASSWORD:-d0a1pass}
+      WORDPRESS_DB_PASSWORD: ${MYSQL_PASSWORD:?Set MYSQL_PASSWORD in .env}
     depends_on:
       db:
         condition: service_healthy