Simpler gallery

- use splide.js
- iterate though a directory automatically

docs/app/app.md

@@ -2,7 +2,9 @@
 title: InvenTree Mobile App
 ---
 
-{% include "app_carousel.html" %}
+{% with directory="appgallery" %}
+{% include "carousel.html" %}
+{% endwith %}
 
 -----
 

docs/index.md

@@ -12,6 +12,8 @@ hide:
 
 --------------
 
-{% include "index_carousel.html" %}
+{% with directory="indexgallery" %}
+{% include "carousel.html" %}
+{% endwith %}
 
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