Unified across files / updated README file.

Signed-off-by: Kaloyan Nikolov <tzerber@gmail.com>

.examples/docker-compose/insecure/mariadb/fpm/compose.yaml

@@ -2,7 +2,8 @@ services:
   # Note: MariaDB is an external service. You can find more information about the configuration here:
   # https://docs.linuxserver.io/images/docker-mariadb/#environment-variables-e
   db:
-    image: mariadb:10.11
+    # Note: Check the recommend version here: https://docs.nextcloud.com/server/latest/admin_manual/installation/system_requirements.html#server
+    image: mariadb:lts
     command: --transaction-isolation=READ-COMMITTED
     restart: always
     volumes:

.examples/docker-compose/insecure/postgres/fpm/compose.yaml

@@ -2,7 +2,8 @@ services:
   # Note: PostgreSQL is an external service. You can find more information about the configuration here:
   # https://github.com/docker-library/docs/blob/master/postgres/README.md
   db:
-    image: postgres:16-alpine
+    # Note: Check the recommend version here: https://docs.nextcloud.com/server/latest/admin_manual/installation/system_requirements.html#server
+    image: postgres:alpine
     restart: always
     volumes:
       - db:/var/lib/postgresql/data:Z
@@ -33,7 +34,7 @@ services:
   # Note: Nginx is an external service. You can find more information about the configuration here:
   # https://hub.docker.com/_/nginx/
   web:
-    image: nginx:alpine
+    image: nginx:alpine-slim
     restart: always
     ports:
       - 127.0.0.1:8080:80

.examples/docker-compose/with-nginx-proxy/mariadb/apache/compose.yaml

@@ -2,7 +2,8 @@ services:
   # Note: MariaDB is an external service. You can find more information about the configuration here:
   # https://docs.linuxserver.io/images/docker-mariadb/#environment-variables-e
   db:
-    image: mariadb:10.11
+    # Note: Check the recommend version here: https://docs.nextcloud.com/server/latest/admin_manual/installation/system_requirements.html#server
+    image: mariadb:lts
     command: --transaction-isolation=READ-COMMITTED
     restart: always
     volumes:

.examples/docker-compose/with-nginx-proxy/mariadb/fpm/compose.yaml

@@ -2,7 +2,8 @@ services:
   # Note: MariaDB is an external service. You can find more information about the configuration here:
   # https://docs.linuxserver.io/images/docker-mariadb/#environment-variables-e
   db:
-    image: mariadb:10.11
+    # Note: Check the recommend version here: https://docs.nextcloud.com/server/latest/admin_manual/installation/system_requirements.html#server
+    image: mariadb:lts
     command: --transaction-isolation=READ-COMMITTED
     restart: always
     volumes:
@@ -39,7 +40,7 @@ services:
   # Note: Nginx is an external service. You can find more information about the configuration here:
   # https://hub.docker.com/_/nginx/
   web:
-    image: nginx:alpine
+    image: nginx:alpine-slim
     restart: always
     volumes:
       # https://docs.nextcloud.com/server/latest/admin_manual/installation/nginx.html

.examples/docker-compose/with-nginx-proxy/postgres/apache/compose.yaml

@@ -2,7 +2,8 @@ services:
   # Note: PostgreSQL is an external service. You can find more information about the configuration here:
   # https://github.com/docker-library/docs/blob/master/postgres/README.md
   db:
-    image: postgres:16-alpine
+    # Note: Check the recommend version here: https://docs.nextcloud.com/server/latest/admin_manual/installation/system_requirements.html#server
+    image: postgres:alpine
     restart: always
     volumes:
       - db:/var/lib/postgresql/data:Z

.examples/docker-compose/with-nginx-proxy/postgres/fpm/compose.yaml

@@ -2,7 +2,8 @@ services:
   # Note: PostgreSQL is an external service. You can find more information about the configuration here:
   # https://github.com/docker-library/docs/blob/master/postgres/README.md
   db:
-    image: postgres:16-alpine
+    # Note: Check the recommend version here: https://docs.nextcloud.com/server/latest/admin_manual/installation/system_requirements.html#server
+    image: postgres:alpine
     restart: always
     volumes:
       - db:/var/lib/postgresql/data:Z
@@ -34,7 +35,7 @@ services:
   # Note: Nginx is an external service. You can find more information about the configuration here:
   # https://hub.docker.com/_/nginx/
   web:
-    image: nginx:alpine
+    image: nginx:alpine-slim
     restart: always
     volumes:
       # https://docs.nextcloud.com/server/latest/admin_manual/installation/nginx.html