docs: move all bubble states into a collapsed section

README.md

@@ -27,11 +27,7 @@
 </p>
 
 <p align="center">
-  <img src="res/screenshots/bubble.png" alt="The bubble above the Plasma lock screen: looking, recognised, not recognised, and a crossed-out camera while another app uses the camera" width="900">
-</p>
-
-<p align="center">
-  <img src="res/screenshots/pill.png" alt="The small pill style of the bubble above the Plasma lock screen: looking, recognised, not recognised, and a crossed-out camera while another app uses the camera" width="900">
+  <img src="res/screenshots/bubble.png" alt="The bubble above the Plasma lock screen: looking, recognised, not recognised" width="720">
 </p>
 
 ## Install
@@ -117,6 +113,19 @@ Press **1** and look at the camera. Then lock the screen and look at it.
 
 </details>
 
+<details>
+<summary>All bubble states</summary>
+
+<p align="center">
+  <img src="res/screenshots/bubble-states.png" alt="The bubble above the Plasma lock screen: looking, recognised, not recognised, and a crossed-out camera while another app uses the camera" width="900">
+</p>
+
+<p align="center">
+  <img src="res/screenshots/pill.png" alt="The small pill style of the bubble: the same four states" width="900">
+</p>
+
+</details>
+
 ## Is it safe?
 
 It is a convenience upgrade, not extra security. Your webcam only sees a flat picture, so