Added minor changes to the README.md file:
Added minor changes to the README.md file:

 - Added a note about the nokogiri package dependencies when using
   Bundler.
 - Reorganized the whole "Use Jekyll directly" section for better
   readability.

anweiss/docker.github.io,menglingwei/denverdino.github.io,alexisbellido/docker.github.io,menglingwei/denverdino.github.io,docker/docker.github.io,alexisbellido/docker.github.io,JimGalasyn/docker.github.io,joaofnfernandes/docker.github.io,joaofnfernandes/docker.github.io,joaofnfernandes/docker.github.io,shin-/docker.github.io,denverdino/docker.github.io,bdwill/docker.github.io,phiroict/docker,docker/docker.github.io,shubheksha/docker.github.io,joeuo/docker.github.io,thaJeztah/docker.github.io,shubheksha/docker.github.io,bdwill/docker.github.io,anweiss/docker.github.io,JimGalasyn/docker.github.io,docker/docker.github.io,joeuo/docker.github.io,jzwlqx/denverdino.github.io,sanscontext/docker.github.io,londoncalling/docker.github.io,denverdino/docker.github.io,docker-zh/docker.github.io,shin-/docker.github.io,JimGalasyn/docker.github.io,denverdino/denverdino.github.io,johnstep/docker.github.io,joeuo/docker.github.io,johnstep/docker.github.io,anweiss/docker.github.io,phiroict/docker,joaofnfernandes/docker.github.io,bdwill/docker.github.io,docker/docker.github.io,bdwill/docker.github.io,phiroict/docker,jzwlqx/denverdino.github.io,jzwlqx/denverdino.github.io,londoncalling/docker.github.io,jzwlqx/denverdino.github.io,JimGalasyn/docker.github.io,londoncalling/docker.github.io,thaJeztah/docker.github.io,docker-zh/docker.github.io,shubheksha/docker.github.io,LuisBosquez/docker.github.io,denverdino/denverdino.github.io,johnstep/docker.github.io,phiroict/docker,anweiss/docker.github.io,docker-zh/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,menglingwei/denverdino.github.io,alexisbellido/docker.github.io,denverdino/denverdino.github.io,denverdino/docker.github.io,anweiss/docker.github.io,thaJeztah/docker.github.io,alexisbellido/docker.github.io,docker-zh/docker.github.io,joeuo/docker.github.io,londoncalling/docker.github.io,johnstep/docker.github.io,LuisBosquez/docker.github.io,shin-/docker.github.io,menglingwei/denverdino.github.io,LuisBosquez/docker.github.io,alexisbellido/docker.github.io,thaJeztah/docker.github.io,sanscontext/docker.github.io,LuisBosquez/docker.github.io,sanscontext/docker.github.io,shubheksha/docker.github.io,phiroict/docker,JimGalasyn/docker.github.io,bdwill/docker.github.io,shubheksha/docker.github.io,menglingwei/denverdino.github.io,denverdino/docker.github.io,denverdino/docker.github.io,shin-/docker.github.io,joaofnfernandes/docker.github.io,sanscontext/docker.github.io,shin-/docker.github.io,joeuo/docker.github.io,londoncalling/docker.github.io,johnstep/docker.github.io,docker-zh/docker.github.io,jzwlqx/denverdino.github.io,denverdino/denverdino.github.io,denverdino/denverdino.github.io,LuisBosquez/docker.github.io,sanscontext/docker.github.io