docs(Docker): Refactored Docker environment. (#16825)

docker-compose.yml renamed to sample.docker-compose.yml.
docker-compose.yml added to .gitignore so every developer can copy it from sample.docker-compose.yml and make changes according to their local needs.

docs(Docker): Updated docs for Docker install.
Added Docker specific installation instructions.

docs(Docker): Applied changes requested on PR.
Extra 8000 port forwarding removed.
Mongo db configuration moved inside dokcer-compose config.
Cleanup spacing and typos.

docs(Docker): Added docker and docker-compose installation links.

.gitignore

@@ -56,3 +56,5 @@ public/css/main*
 webpack-bundle-stats.html
 server/rev-manifest.json
 google-credentials.json
+
+docker-compose.yml

CONTRIBUTING.md

@@ -288,6 +288,27 @@ node seed
 npm run develop
 ```
 
+### Setup freeCodeCamp via Docker
+
+You need to have [docker](https://docs.docker.com/install/) and [docker-compose](https://docs.docker.com/compose/install/) installed before executing commands below.
+
+Create docker-compose.yml from sample file
+```bash
+cp sample.docker-compose.yml docker-compose.yml
+```
+
+Setup and run project:
+```bash
+# Setup project
+docker-compose run --rm node npm install
+docker-compose run --rm node npm run only-once
+```
+```bash
+# Run project
+docker-compose up
+```
+
+
 ### Make Changes
 
 This bit is up to you!

docker-compose.yml

@@ -1,28 +0,0 @@
-# Docker Compose file for FreeCodeCamp
-#
-# Bootstrap with:
-#   docker-compose run --rm server npm install
-#   docker-compose run --rm server npm run only-once
-#
-# Run with:
-#   docker-compose up
-#
-version: "2"
-services:
-    db:
-        image: mongo:3.2.6
-
-    server:
-        image: node:8.9.0
-        depends_on:
-            - db
-        environment:
-            - MONGOHQ_URL=mongodb://db:27017/freecodecamp
-        volumes:
-            - .:/fcc
-        working_dir: /fcc
-        command:
-            - npm
-            - start
-        ports:
-            - "3000:3000" # Change port if needed

sample.docker-compose.yml

@@ -0,0 +1,31 @@
+# Docker Compose sample file for freeCodeCamp
+# Copy this file to docker-compose.yml
+#
+# Bootstrap with:
+#   docker-compose run --rm node npm install
+#   docker-compose run --rm node npm run only-once
+#
+# Run with:
+#   docker-compose up
+#
+version: "3"
+services:
+  node:
+    image: node:8.9.4
+    volumes:
+      - .:/app
+    working_dir: /app
+    depends_on:
+      - mongo
+    ports:
+      - "3000:3000"
+      - "3002:3002"
+    environment:
+      - MONGOHQ_URL=mongodb://mongo:27017/freecodecamp
+    command: npm run develop
+
+  mongo:
+    image: mongo:3.0.15
+
+  mailhog:
+    image: mailhog/mailhog