Update so there is an open landing page and a login page

- make / public
- add login on index.html
- add UserAttribute
- add hasRole to RemoteAuthentication
- update HomeController to give welcome instead of index if login.
- add welcome.html

src/main/kotlin/ltd/hlaeja/configuration/SecurityConfiguration.kt

@@ -40,5 +40,6 @@ class SecurityConfiguration {
         "/actuator/**",
         "/login",
         "/logout",
+        "/",
     )
 }