Security: HTTPS, WSS, PFS and E2EE with Phoenix framework

My demo site (in future) will support only modern standards. I do not want to support M$ standards, IE and other old leafs of web programming. I decide to CSS3/Ecmascript6/HTML5 in fronted and Elixir/Phoenix + my libs in backend, so I want Modern configuration. Is this configuration describes all SSL configuration must-have or you know more SSL configuration options that should be set (of course we need to generate certificate and add configuration to generated files)?