Update docs.json

update login CTA

Author: kvangundy

docs.json

@@ -9,7 +9,7 @@
   },
   "favicon": "favicon.png",
   "banner": {
-    "content": "🎉 Hypermode Agents Beta is out with no-code agent creation, 2,000+ integrations, and more! [Try Sidekick now! →](/sign-up/)"
+    "content": "🎉 Hypermode Agents Beta is out with no-code agent creation, 2,000+ integrations, and more! [Try Sidekick now! →](https://hypermode.com/login)"
   },
   "navigation": {
     "global": {