Minify README
Minify README

We have lots of duplication between the readme and the website. The
website is properly maintained and *way* better but users don't visit it
and get stuck and confused in the readme (found during usability
testing). Let's primarily get them to visit coala.io!

Closes https://github.com/coala/coala/issues/4079
Closes https://github.com/coala/coala/issues/4065
Closes https://github.com/coala/coala/issues/3696

damngamerz/coala,karansingh1559/coala,SanketDG/coala,shreyans800755/coala,RJ722/coala,kartikeys98/coala,rimacone/testing2,refeed/coala,Asnelchristian/coala,karansingh1559/coala,nemaniarjun/coala,refeed/coala,netman92/coala,RJ722/coala,Asnelchristian/coala,Asnelchristian/coala,refeed/coala,yashLadha/coala,yashLadha/coala,netman92/coala,Shade5/coala,netman92/coala,incorrectusername/coala,RJ722/coala,JohnS-01/coala,aptrishu/coala,rimacone/testing2,CruiseDevice/coala,Shade5/coala,arjunsinghy96/coala,MariosPanag/coala,Asalle/coala,kartikeys98/coala,MariosPanag/coala,coala/coala,Shade5/coala,karansingh1559/coala,Nosferatul/coala,CruiseDevice/coala,MariosPanag/coala,JohnS-01/coala,jayvdb/coala,Nosferatul/coala,jayvdb/coala,Balaji2198/coala,SanketDG/coala,coala/coala,Balaji2198/coala,incorrectusername/coala,shreyans800755/coala,Asalle/coala,coala-analyzer/coala,coala-analyzer/coala,jayvdb/coala,arjunsinghy96/coala,aptrishu/coala,damngamerz/coala,arjunsinghy96/coala,nemaniarjun/coala,Asalle/coala,SanketDG/coala,rimacone/testing2,Balaji2198/coala,CruiseDevice/coala,nemaniarjun/coala,JohnS-01/coala,shreyans800755/coala,aptrishu/coala,yashLadha/coala,coala-analyzer/coala,incorrectusername/coala,coala/coala,Nosferatul/coala,damngamerz/coala,kartikeys98/coala