Remove outdated state diagram

The state machine in the "Future Flow" state diagram has been the
current system for some time now. This commit removes the "Current Flow"
state diagram as it is outdated.

Author: lfdebrux

diagrams/form-states-and-events.md

@@ -1,24 +1,6 @@
 # Form states and events used by state machine
 
-## Current Flow
-
-```mermaid
----
- title: Form states and events called to transition to state
----
-stateDiagram-v2
-    Draft --> Live : make_live!
-    Draft --> Deleted : delete_form!
-    live_with_draft: Live with draft
-    Live --> live_with_draft : create_draft_from_live_form!
-    live_with_draft --> Live : make_live!
-    live_with_draft --> Draft: archive_live_form!
-    Live --> Draft: archive_live_form!
-   
-```
-
-
-## Future Flow
+## State diagram
 
 ```mermaid
 ---