Use example files instead of extra Docker ones

config/database.docker.yml

@@ -1,19 +0,0 @@
-default: &default
-  adapter: postgresql
-  encoding: utf8
-  pool: 5
-  timeout: 5000
-  host: db
-  port: 5432
-
-development:
-  <<: *default
-  database: open_food_network_dev
-  username: ofn
-  password: f00d
-
-test:
-  <<: *default
-  database: open_food_network_test
-  username: ofn
-  password: f00d

config/database.yml

@@ -1,33 +1,19 @@
-development:
+default: &default
   adapter: postgresql
-  encoding: unicode
-  database: open_food_network_dev
+  encoding: utf8
   pool: 5
-  host: localhost
+  timeout: 5000
+  host: db
+  port: 5432
+
+development:
+  <<: *default
+  database: open_food_network_dev
   username: ofn
   password: f00d
 
 test:
-  adapter: postgresql
-  encoding: unicode
+  <<: *default
   database: open_food_network_test
-  pool: 5
-  host: localhost
-  username: ofn
-  password: f00d
-
-production:
-  adapter: postgresql
-  encoding: unicode
-  database: open_food_network_prod
-  pool: 5
-  username: ofn
-  password: f00d
-
-staging:
-  adapter: postgresql
-  encoding: unicode
-  database: open_food_network_prod
-  pool: 5
   username: ofn
   password: f00d

docker-compose.yml

@@ -18,8 +18,8 @@ services:
     volumes:
       - .:/usr/src/app
       - gems:/bundles
-      - ./config/database.docker.yml:/usr/src/app/config/database.yml
-      - ./config/application.docker.yml:/usr/src/app/config/application.yml
+      - ./config/database.yml:/usr/src/app/config/database.yml
+      - ./config/application.example.yml:/usr/src/app/config/application.yml
     depends_on:
       - db
     environment: