improve local build

Author: Grummfy

README.md

@@ -2,19 +2,29 @@
 
 This repo contains the source code for atoum website, [atoum.org](http://atoum.org).
 
-## Install
+## Build & preview locally
 
-* Clone repository
-* Install dependencies (assuming you have a working [bundler](http://bundler.io/) installation).
+* Clone this repository
+* Use one of the following method
+* Then use your favorite browser to [preview it](http://127.0.0.1:4000)
+
+### Using bundle
+
+Install dependencies (assuming you have a working [bundler](http://bundler.io/) installation).
 
 ```bash
 bundle install
+bundle exec jekyll serve --watch
 ```
 
-* Launch local server with generated website
+### Using docker
 
 ```bash
-bundle exec jekyll serve --watch
+docker run -i -t -v $PWD:/srv/jekyll -p 4000:4000 jekyll/jekyll:pages jekyll serve --watch
 ```
 
-* Access to [http://127.0.0.1:4000](http://127.0.0.1:4000) on your favorite browser.
+### Using docker-compose
+
+```bash
+docker-compose up
+```

docker-compose.yml

@@ -2,6 +2,7 @@ jekyll:
   image: jekyll/jekyll:pages
   volumes:
     - .:/srv/jekyll
+  command: ['jekyll', 'serve', '--watch']
   ports:
     - 4000:4000
   environment: