wiki: Document baba-is-float

wiki/Configuration:-Window-Rules.md

@@ -92,6 +92,7 @@ window-rule {
     geometry-corner-radius 12
     clip-to-geometry true
     tiled-state true
+    baba-is-float true
 
     min-width 100
     max-width 200
@@ -846,6 +847,24 @@ window-rule {
 }
 ```
 
+#### `baba-is-float`
+
+<sup>Since: 25.02</sup>
+
+Make your windows FLOAT up and down.
+
+This is an April Fools' 2025 feature.
+
+```kdl
+window-rule {
+    match is-floating=true
+
+    baba-is-float true
+}
+```
+
+https://github.com/user-attachments/assets/3f4cb1a4-40b2-4766-98b7-eec014c19509
+
 #### Size Overrides
 
 You can amend the window's minimum and maximum size in logical pixels.