Align architecture.md to latest DIP, DEB & BEP#39

michatrautweiler wants to merge 8 commits into

SchweizerischeBundesbahnen:masterSchweizerischeBundesbahnen/api-principles:masterfrom

michatrautweiler:fix-deb-dip-bepmichatrautweiler/api-principles:fix-deb-dip-bepCopy head branch name to clipboard