play with prometheus docs

steps

1. prerequisites

   1. ruby and gems

       $ git clone https://github.com/gree2/docs.git
       $ cd docs
       $ bundle
       zsh: /usr/local/bin/bundle: bad interpreter: /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin: no such file or directory
      

   2. fixed problem-with-bundle

       $ gem uninstall bundler
       $ gem install bundler
      

   3. install gems

       $ bundle
       Fetching gem metadata from https://rubygems.org/.........
       Fetching rack 1.5.2
       Installing rack 1.5.2
       Fetching adsf 1.2.0
       Installing adsf 1.2.0
       Fetching builder 3.2.2
       Installing builder 3.2.2
       Using bundler 1.16.2
       ...
       Fetching rspec 3.5.0
       Installing rspec 3.5.0
       Bundle complete! 14 Gemfile dependencies, 43 gems now installed.
       Use `bundle info [gemname]` to see where a bundled gem is installed.
      

2. building

    # gen static site
    $ make build
    # stored in output dir
    ...
          create  [0.22s]  output/blog/index.html
          create  [0.02s]  output/blog/feed.xml
   
    Site compiled in 179.12s.
   

3. dev server

    # rebuild the site whenever relevant files change
    $ bundle exec guard
   
    # start the local dev server
    $ bundle exec nanoc view
    # http://localhost:3000/