minor improvements.

docs/extras/buzzer.md

@@ -11,11 +11,12 @@ It emulates a bluetooth keyboard and thus can be used with the photobooth-app or
 
 ### Hardware and Assembly
 
-see separate git repository <https://github.com/photobooth-app/photobooth-buzzer>
+See separate git repository <https://github.com/photobooth-app/photobooth-buzzer>.
+The button might have a twist and turn unlock mechanism. It can be removed easily to convert it to a normal button.
 
 ### ESP Microcontroller Software
 
-see separate git repository <https://github.com/photobooth-app/photobooth-buzzer>
+See separate git repository <https://github.com/photobooth-app/photobooth-buzzer>.
 
 ### Setup in photobooth app
 

docs/extras/index.md

@@ -1,3 +1,8 @@
 # Extras
 
 This sections describes additional hardware and operating system customization to enhance the photobooth.
+
+- [Add a battery powered buzzer](buzzer.md) to remotely trigger actions!
+- [Enhance reliability utilizing a UPS](ups.md) to shutdown the photobooth properly!
+
+You made some extras? [Show and tell everybody!](https://github.com/photobooth-app/photobooth-app/discussions/categories/show-and-tell) on Github discussions.

mkdocs.yml

@@ -115,13 +115,13 @@ nav:
   - Extras:
       - extras/index.md
       - extras/buzzer.md
+      - extras/ups.md
       - extras/display.md
       - extras/onscreenkeyboard.md
       - extras/printerexample.md
       - extras/sync.md
       - extras/wifi.md
       - extras/wled.md
-      - extras/ups.md
 
 not_in_nav: |
   /extras/shareservice-landing.md