Added mount point and simplified Dockerfile usage

* Added VOLUME sharing and default WORKDIR to Docker
* Simplified Docker installation commands
* Adjusted git coordinates to use HTTPS

CONTRIBUTING.md

@@ -34,11 +34,10 @@ In order to build the documentation site, you will need:
 
 **Docker**
 
-To install this site on Docker, simply execute the following commands.
+To build and run this site on Docker, execute the following commands:
 
-* `cd docker`
-* `docker build -t intellij-sdk-docs .`
-* `docker run -it -p 4000:4000 intellij-sdk-docs /bin/bash -c 'cd intellij-sdk-docs && rake preview'`
+* `docker build -t intellij-sdk-docs /intellij-sdk-docs`
+* `docker run intellij-sdk-docs` 
 
 **OS X**
 

docker/Dockerfile

@@ -14,15 +14,20 @@ RUN \
   apt-get install --yes nodejs
 
 RUN \
-  gem install bundler && \
-# git clone --depth 1 http://github.com/jetbrains/intellij-sdk-docs && \
-  git clone --depth 1 http://github.com/breandan/intellij-sdk-docs && \
+  gem install bundler
+
+RUN \
+  git clone --depth 1 https://github.com/jetbrains/intellij-sdk-docs.git /intellij-sdk-docs && \
   cd intellij-sdk-docs && \
   git submodule init && \
   git submodule update
 
-RUN \
-  cd intellij-sdk-docs && \
-  rake bootstrap
+RUN cd intellij-sdk-docs && rake bootstrap
+
+VOLUME /intellij-sdk-docs
+
+WORKDIR /intellij-sdk-docs
 
 EXPOSE 4000
+
+CMD rake preview