Mention branching model in README
Mention branching model in README

The following branches are used:
- master with only static content, published in live on site
- dynamic, where development happens
Content of master branch should be generated from dynamic branch. This
is done this way because github pages use --safe mode with Jeyll,
disabling the use of plugins.

michaelpq/michaelpq.github.io,michaelpq/michaelpq.github.io