Added yaml menu example
Added yaml menu example

Added yaml menu example, matching with existing toml example. Also added link to sitewide config page.

fhergomez/hugo,gohugoio/hugo,digitalcraftsman/hugo,MarkDBlackwell/hugo,tubo028/hugo,vbatoufflet/hugo,tjyang/hugo,gohugoio/hugo,sprig/hugo,tjyang/hugo,mdhender/hugo,halostatue/hugo,anthonyfok/hugo,soundrussian/hugo,soundrussian/hugo,mitchchn/hugo,jygastaud/hugo,bramp/hugo,ifraixedes/hugo,fhergomez/hugo,derekperkins/hugo,ffrizzo/hugo,tatsushid/hugo,ffrizzo/hugo,Zenithar/hugo,tischda/hugo,tubo028/hugo,bogem/hugo,ryanclarke/hugo,mayah/hugo,fedelibre/hugo,melo/hugo,sprig/hugo,ifraixedes/hugo,digitalcraftsman/hugo,badoet/hugo,coderzh/hugo,derekperkins/hugo,fedelibre/hugo,kujohn/hugo,mdhender/hugo,tischda/hugo,Zenithar/hugo,mitchchn/hugo,MarkDBlackwell/hugo,mdhender/hugo,mdhender/hugo,abourget/hugo,halostatue/hugo,coderzh/hugo,bogem/hugo,fedelibre/hugo,anthonyfok/hugo,melo/hugo,kujohn/hugo,ryanclarke/hugo,fedelibre/hugo,jygastaud/hugo,badoet/hugo,vbatoufflet/hugo,gohugoio/hugo,anthonyfok/hugo,abourget/hugo,mayah/hugo,bramp/hugo,tatsushid/hugo