put examples each in own directory and send html to docs/ directory

[brentp]

once I get docs/ set up, sending the interactive output of the examples to the docs//examples/ subdir would be a nice addition.

[timotheecour]

instead of checking in files, how about this:

• the generated html are hosted on github pages
• they're udpated on each commit
• README mentions a link to them and a way to run that command locally

Same as done here: https://github.com/citycide/glob/blob/a7ed90c8bd36613417ecc435ee76b58f50352503/.travis.yml#L40 which generates https://citycide.github.io/glob/ for this repo: https://github.com/citycide/glob