change overleaf container names

closes #23

ansible/roles/overleaf/templates/docker-compose.yml.j2

@@ -10,18 +10,18 @@ services:
     sharelatex:
         restart: always
         image: sharelatex/sharelatex
-        container_name: sharelatex
+        container_name: overleaf
         networks:
           - traefik
           - internal
         depends_on:
-            mongo:
+            overleaf-mongodb:
                 condition: service_healthy
-            redis:
+            overleaf-redis:
                 condition: service_started
         links:
-            - mongo
-            - redis
+            - overleaf-mongodb
+            - overleaf-redis
         stop_grace_period: 60s
         volumes:
             - {{ data_dir }}/overleaf/sharelatex_data:/var/lib/sharelatex
@@ -37,12 +37,12 @@ services:
         environment:
             SHARELATEX_APP_NAME: Overleaf Community Edition
 
-            SHARELATEX_MONGO_URL: mongodb://mongo:27017/sharelatex
+            SHARELATEX_MONGO_URL: mongodb://overleaf-mongodb:27017/sharelatex
 
             # Same property, unfortunately with different names in
             # different locations
-            SHARELATEX_REDIS_HOST: redis
-            REDIS_HOST: redis
+            SHARELATEX_REDIS_HOST: overleaf-redis
+            REDIS_HOST: overleaf-redis
 
             ENABLED_LINKED_FILE_TYPES: 'project_file,project_output_file'
 
@@ -79,10 +79,10 @@ services:
             # SHARELATEX_EMAIL_SMTP_LOGGER: true
             # SHARELATEX_CUSTOM_EMAIL_FOOTER: "This system is run by department x"
 
-    mongo:
+    overleaf-mongodb:
         restart: always
         image: mongo:4.4
-        container_name: mongo
+        container_name: overleaf-mongodb
         networks:
           - internal
         expose:
@@ -95,10 +95,10 @@ services:
             timeout: 10s
             retries: 5
 
-    redis:
+    overleaf-redis:
         restart: always
         image: redis:5
-        container_name: redis
+        container_name: overleaf-redis
         networks:
           - internal
         expose: