replace architecture doc with etcvd version
replace architecture doc with etcvd version

matthewdupre/felix,nbartos/calico,neiljerram/felix,neiljerram/felix,alexhersh/calico,ocadotechnology/calico,anortef/calico,ocadotechnology/calico,alexhersh/calico,anortef/calico,TrimBiggs/calico,kasisnu/calico,beddari/calico,kasisnu/calico,matthewdupre/felix,beddari/calico,TrimBiggs/calico,Metaswitch/calico,neiljerram/felix,Metaswitch/calico,nbartos/calico,neiljerram/felix