Add PWA step

Author: Matt Raible

jhipster/demo.adoc

@@ -138,6 +138,8 @@ deployment {
 
 . Show JHipster Registry at `http://localhost:8761` and gateway at `http://localhost:8080`
 
+. Convert gateway to be a PWA and rebuild image
+
 == Configure JHipster Microservices to use Okta for Identity
 
 . Create a web app on Okta, use `http://localhost:8080/login/oauth2/code/oidc` for redirect URI
@@ -164,6 +166,8 @@ deployment {
 
 . Demo JHipster Registry and gateway log in with Okta
 
+. Show Lighthouse Score
+
 . Finito! 🤓
 
 == Learn More!