Upgrade Jekyll and simplify deployment

* [x] upgrade from Jekyll 0.11 to 1.3
* [x] replace categories plugin so we can use GitHub Pages directly
* [ ] remove yegrb.github.com repo
* [ ] remove drone.io build webhook
* [ ] rename this repo to yegrb.github.io
update url to repo to yegrb.github.io
jekyll 1.3.1
Merge pull request #4 from yegrb/jekyll_one

Upgrade Jekyll and simplify deployment