docs: Add notion of exiting the themes folder in quickstart
docs: Add notion of exiting the themes folder in quickstart

anthonyfok/hugo,digitalcraftsman/hugo,mdhender/hugo,digitalcraftsman/hugo,gohugoio/hugo,tubo028/hugo,MarkDBlackwell/hugo,vbatoufflet/hugo,anthonyfok/hugo,anthonyfok/hugo,mdhender/hugo,melo/hugo,ffrizzo/hugo,gohugoio/hugo,fedelibre/hugo,fedelibre/hugo,ffrizzo/hugo,mitchchn/hugo,mitchchn/hugo,MarkDBlackwell/hugo,Zenithar/hugo,jygastaud/hugo,Zenithar/hugo,abourget/hugo,fedelibre/hugo,vbatoufflet/hugo,mayah/hugo,tischda/hugo,abourget/hugo,fedelibre/hugo,bogem/hugo,tubo028/hugo,bogem/hugo,mayah/hugo,mdhender/hugo,mdhender/hugo,gohugoio/hugo,jygastaud/hugo,tischda/hugo,melo/hugo