docs/conf.py: Generate from local source
docs/conf.py: Generate from local source

... instead from a local installation.

Closes https://github.com/coala/coala/issues/3785

Balaji2198/coala,shreyans800755/coala,coala-analyzer/coala,JohnS-01/coala,kartikeys98/coala,arush0311/coala,CruiseDevice/coala,Asnelchristian/coala,incorrectusername/coala,ayushin78/coala,nemaniarjun/coala,aptrishu/coala,CruiseDevice/coala,MariosPanag/coala,kartikeys98/coala,netman92/coala,Asalle/coala,rimacone/testing2,Asalle/coala,Balaji2198/coala,karansingh1559/coala,shreyans800755/coala,nemaniarjun/coala,JohnS-01/coala,arjunsinghy96/coala,netman92/coala,CruiseDevice/coala,jayvdb/coala,coala/coala,Asalle/coala,incorrectusername/coala,karansingh1559/coala,shreyans800755/coala,aptrishu/coala,MariosPanag/coala,coala/coala,coala-analyzer/coala,ayushin78/coala,jayvdb/coala,refeed/coala,arush0311/coala,SanketDG/coala,SanketDG/coala,SanketDG/coala,RJ722/coala,Nosferatul/coala,karansingh1559/coala,Balaji2198/coala,netman92/coala,sagark123/coala,arjunsinghy96/coala,sagark123/coala,coala/coala,RJ722/coala,arjunsinghy96/coala,sagark123/coala,ayushin78/coala,damngamerz/coala,yashLadha/coala,MariosPanag/coala,jayvdb/coala,damngamerz/coala,coala-analyzer/coala,aptrishu/coala,Nosferatul/coala,arush0311/coala,yashLadha/coala,Asnelchristian/coala,incorrectusername/coala,JohnS-01/coala,Shade5/coala,refeed/coala,rimacone/testing2,damngamerz/coala,Shade5/coala,Asnelchristian/coala,nemaniarjun/coala,kartikeys98/coala,refeed/coala,yashLadha/coala,Shade5/coala,RJ722/coala,Nosferatul/coala,rimacone/testing2