Automate update documentation Webpage

Currently the process of updating the documentation page involves

``` shell
git checkout gh-pages
git checkout master -- README.md
echo "---\nlayout: index\n---" | cat - README.md > index.md
git add -A
git commit -m "update docs"
git push origin gh-pages
```

this is an error prone process, so It would be nice if we could do 

``` shell
make docs
```
