Update README about configuration options for JavaScript urls. [ci skip]
Update README about configuration options for JavaScript urls. [ci skip]

funbaker/astropy,StuartLittlefair/astropy,tbabej/astropy,mhvk/astropy,pllim/astropy,mhvk/astropy,joergdietrich/astropy,MSeifert04/astropy,larrybradley/astropy,stargaser/astropy,mhvk/astropy,astropy/astropy,kelle/astropy,bsipocz/astropy,dhomeier/astropy,mhvk/astropy,kelle/astropy,AustereCuriosity/astropy,aleksandr-bakanov/astropy,bsipocz/astropy,aleksandr-bakanov/astropy,astropy/astropy,saimn/astropy,astropy/astropy,kelle/astropy,mhvk/astropy,lpsinger/astropy,stargaser/astropy,DougBurke/astropy,larrybradley/astropy,StuartLittlefair/astropy,aleksandr-bakanov/astropy,astropy/astropy,MSeifert04/astropy,StuartLittlefair/astropy,MSeifert04/astropy,pllim/astropy,funbaker/astropy,joergdietrich/astropy,dhomeier/astropy,joergdietrich/astropy,funbaker/astropy,pllim/astropy,lpsinger/astropy,pllim/astropy,kelle/astropy,joergdietrich/astropy,lpsinger/astropy,funbaker/astropy,AustereCuriosity/astropy,larrybradley/astropy,StuartLittlefair/astropy,AustereCuriosity/astropy,aleksandr-bakanov/astropy,pllim/astropy,AustereCuriosity/astropy,AustereCuriosity/astropy,lpsinger/astropy,StuartLittlefair/astropy,saimn/astropy,DougBurke/astropy,tbabej/astropy,joergdietrich/astropy,stargaser/astropy,dhomeier/astropy,dhomeier/astropy,tbabej/astropy,bsipocz/astropy,stargaser/astropy,lpsinger/astropy,tbabej/astropy,MSeifert04/astropy,larrybradley/astropy,saimn/astropy,tbabej/astropy,saimn/astropy,larrybradley/astropy,saimn/astropy,DougBurke/astropy,DougBurke/astropy,kelle/astropy,dhomeier/astropy,bsipocz/astropy,astropy/astropy