feat: add link to adminer website + specify name and version for docker compose

Author: Valentin Ryckaert

docker-compose.yml

@@ -38,7 +38,8 @@ services:
     volumes:
       - db-data:/var/lib/postgresql/data
   adminer:
-    image: adminer
+    container_name: ${PREFIX}-adminer
+    image: adminer:5.4.2
     restart: always
     ports:
       - 8080:8080

docs/docker.md

@@ -59,10 +59,9 @@ TeSS is accessible at the following URL:
 
 <http://localhost:3000>
 
+### Access [Adminer](https://www.adminer.org/)
 
-### Access Adminer
-
-An Adminer instance is accessible at the following URL:
+An Adminer instance to connect to and visualize your local database is accessible at the following URL:
 
 <http://localhost:8080>