feat: add link to git in settings

src/routes/settings/+page.svelte

@@ -22,6 +22,18 @@
 
   <NostrWalletConnect />
 
+  <div class="retro-card">
+    <h2>Source Code</h2>
+    <Button
+      variant="secondary"
+      onclick={() => {
+        window.open("https://git.arx-ccn.com/Arx/PortalBTC", "_blank");
+      }}
+    >
+      View on Git
+    </Button>
+  </div>
+
   <DangerZone />
 </div>