Mark exterminator design as removed.

For future ref, these types of documents should still exist but be marked as removed and explain why the design was poor so future contribs can see what has worked and what hasn't.

Author: ArtisticRoomba

src/en/space-station-14/round-flow/antagonists/exterminator.md

@@ -1,13 +1,15 @@
 # Exterminator
-```admonish warning "Attention: Legacy Documentation!"
-This document is ported from before the game-area reorganization and has not been reviewed or updated.
-It may not fit with the new design requirements.
-```
-```admonish warning "Possible Removal"
-This content is being considered for removal, and may no longer be in-game in the future.
+
+```admonish warning "Removed"
+This content was removed in [#26978](https://github.com/space-wizards/space-station-14/pull/26978) due to the following:
+- At the time, the YAML was hostile to the ongoing medical refactor work.
+- The actual implementation encourages taking on the entire station/murderboning which is antithetical to the proposed design of minimal crossfire.
+- The antagonist was heavily metagamed.
+- There were calls for a complete redesign.
 ```
-| Designers | Implemented | GitHub Links |
-|---|---|---|
+
+| Designers  | Implemented            | GitHub Links                                                 |
+|------------|------------------------|--------------------------------------------------------------|
 | deltanedas | :white_check_mark: Yes | https://github.com/space-wizards/space-station-14/pull/19946 |
 
 ## Abstract