feat: Implement collection deletion and loading spinners

- Add API endpoint and handler to delete collections
- Introduce LoadingSpinner component for async operations
- Show loading spinners during file loading and preview rendering
- Enhance modal accessibility by removing aria-hidden attribute
- Refactor delete functionality to distinguish between collections and files/folders
- Remove unused collection definitions from config

collections/documents/getting_started/hero_native.md

@@ -0,0 +1,22 @@
+## Basic Hero
+
+You can build Hero natively with the following lines:
+
+```
+curl https://raw.githubusercontent.com/freeflowuniverse/herolib/refs/heads/development/install_hero.sh > /tmp/install_hero.sh
+bash /tmp/install_hero.sh
+```
+
+## Hero for Developers
+
+For developers, use the following commands:
+
+```
+curl 'https://raw.githubusercontent.com/freeflowuniverse/herolib/refs/heads/development/install_v.sh' > /tmp/install_v.sh
+bash /tmp/install_v.sh --analyzer --herolib 
+#DONT FORGET TO START A NEW SHELL (otherwise the paths will not be set)
+```
+
+## Hero with Docker
+
+If you have issues running Hero natively, you can use the [Docker version of Hero](hero_docker.md).