update selfhst icon-URLs to use @master path (#9543)

* update selfhst icon-URLs to use @master path

Changed all icon URLs in JSON files from 'cdn.jsdelivr.net/gh/selfhst/icons/webp/' to 'cdn.jsdelivr.net/gh/selfhst/icons@master/webp/' for consistency and to ensure the latest icons are referenced.

* added missing icons

frontend/public/json/archlinux-vm.json

@@ -11,7 +11,7 @@
   "interface_port": null,
   "documentation": "https://wiki.archlinux.org/title/Main_page",
   "website": "https://archlinux.org/",
-  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons/webp/arch-linux.webp",
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@master/webp/arch-linux.webp",
   "config_path": "",
   "description": "Arch Linux is a highly customizable, independent Linux distribution that gives users complete control over their system. Known for its rolling release model, Arch Linux is always up-to-date with the latest software. It's favored by experienced users who appreciate its minimalist approach, demanding a hands-on installation and configuration process. This level of control and flexibility makes it a popular choice for those who want to tailor their Linux system to their exact needs.",
   "install_methods": [