Update jekyll doc url in README.md
Update jekyll doc url in README.md

Updated jekyll doc url from 'jekyllrb.com/docs/' to 'http://jekyllrb.com/docs/home/'

'jekyllrb.com/docs/' - was leading to this 404 page: 'https://github.com/toddmotto/blog/blob/patch-1/jekyllrb.com/docs'
sasteg/blog,sasteg/blog,thoughtram/blog,thoughtram/blog,thoughtram/blog