Remove redundant loaders and update styling

Deleted the previously redundant loaders from blog and docs sections. Updated the loading.tsx files in home to utilize the GlobalLoader component with improved styling. Additionally, styling in global-loader.tsx from the ui package has been modified to ensure better visibility.

apps/web/app/(marketing)/blog/loading.tsx

@@ -1,3 +0,0 @@
-import { GlobalLoader } from '@kit/ui/global-loader';
-
-export default GlobalLoader;

apps/web/app/(marketing)/docs/loading.tsx

@@ -1,3 +0,0 @@
-import { GlobalLoader } from '@kit/ui/global-loader';
-
-export default GlobalLoader;

apps/web/app/home/loading.tsx

@@ -1,3 +1,5 @@
 import { GlobalLoader } from '@kit/ui/global-loader';
 
-export default GlobalLoader;
+export default function Loading() {
+  return <GlobalLoader fullPage />;
+}