website/docs: add additional docs

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

website/docs/flow/stages/user_login.md

@@ -5,3 +5,19 @@ title: User login stage
 This stage attaches a currently pending user to the current session.
 
 It can be used after `user_write` during an enrollment flow, or after a `password` stage during an authentication flow.
+
+## Session duration
+
+By default, the authentik session expires when you close your browser (*seconds=0*).
+
+You can set the session to expire after any duration using the syntax of `hours=1,minutes=2,seconds=3`. The following keys are allowed:
+
+- Microseconds
+- Milliseconds
+- Seconds
+- Minutes
+- Hours
+- Days
+- Weeks
+
+All values accept floating-point values.

website/docs/flow/stages/user_write.md

@@ -3,3 +3,5 @@ title: User write stage
 ---
 
 This stages writes data from the current context to the current pending user. If no user is pending, a new one is created.
+
+Newly created users can be created as inactive and can be assigned to a selected group.