docs: add GitLab links and Docker Hub compose images

docs-site/src/components/Header.astro

@@ -46,6 +46,9 @@ function navIcon(href: string) {
   if (href.includes('github.com/3252a8/remnawave-minishop')) {
     return 'github'
   }
+  if (href.includes('gitlab.com/3252a8/remnawave-minishop')) {
+    return 'gitlab'
+  }
   if (href.includes('t.me/remnawave_minishop')) {
     return 'telegram'
   }