add trial license cta in docs

Author: msukkari

docs/self-hosting/license-key.mdx

@@ -3,6 +3,10 @@ title: License key
 sidebarTitle: License key
 ---
 
+<Note>
+If you'd like a trial license, [reach out](https://www.sourcebot.dev/contact) and we'll send one over within 24 hours
+</Note>
+
 All core Sourcebot features are available in Sourcebot OSS (MIT Licensed). Some additional features require a license key. See the [pricing page](https://www.sourcebot.dev/pricing) for more details.