Add dedicated dotnet tab for dotnet portable build

We are listing these portable builds under all OS tabs, which may confuse users because each OS also has its own platform-specific builds that we refer to as “portable” in our documentation. To avoid confusion, separate the tabs accordingly.

src/data/downloads.tsx

@@ -16,7 +16,8 @@ export enum OsType {
   Docker,
   Linux,
   MacOS,
-  Windows
+  Windows,
+  DotNet,
 }
 
 export type Button = {
@@ -275,11 +276,11 @@ sudo apt install jellyfin`}
   {
     id: 'portable',
     name: 'Portable',
-    osTypes: [OsType.Linux, OsType.MacOS, OsType.Windows],
+    osTypes: [OsType.DotNet],
     status: DownloadStatus.Official,
     features: [],
     platforms: [Platform.DotNet],
-    description: 'The portable version can be run on any system with a .NET Core runtime.',
+    description: 'The portable version can be run on any system with a .NET runtime.',
     stableButtons: [
       {
         id: 'portable-manual-stable-link',

src/pages/downloads/dotnet.tsx

@@ -0,0 +1,8 @@
+import React from 'react';
+
+import DownloadsPage from './server';
+import { OsType } from '../../data/downloads';
+
+export default function DotNetDownloads() {
+  return <DownloadsPage osType={OsType.DotNet} />;
+}

src/pages/downloads/server.tsx

@@ -62,6 +62,12 @@ export default function DownloadsPage({ osType = OsType.Linux }: { osType?: OsTy
                 >
                   macOS
                 </Link>
+                <Link
+                  to='/downloads/dotnet'
+                  className={clsx('pills__item', { 'pills__item--active': osType === OsType.DotNet })}
+                >
+                  DotNet
+                </Link>
               </div>
             </div>