Update Slack community link in README and add Discord invitation for contributions

Author: JerryWu1234

README.md

@@ -20,7 +20,7 @@
       <img alt="MIT License" src="media/light_license.svg" />
     </picture>
   </a>
-  <a href="https://join.slack.com/t/stagehand-dev/shared_invite/zt-38khc8iv5-T2acb50_0OILUaX7lxeBOg">
+  <a href="https://stagehand-dev.slack.com">
     <picture>
       <source media="(prefers-color-scheme: dark)" srcset="media/dark_slack.svg" />
       <img alt="Slack Community" src="media/light_slack.svg" />
@@ -122,9 +122,8 @@ nano .env # Edit the .env file to add API keys
 ## Contributing
 
 > [!NOTE]  
-> We highly value contributions to Stagehand! For questions or support, please join our [Slack community](https://join.slack.com/t/stagehand-dev/shared_invite/zt-38khc8iv5-T2acb50_0OILUaX7lxeBOg).
-
-At a high level, we're focused on improving reliability, speed, and cost in that order of priority. If you're interested in contributing, we strongly recommend reaching out to [Miguel Gonzalez](https://x.com/miguel_gonzf) or [Paul Klein](https://x.com/pk_iv) in our [Slack community](https://join.slack.com/t/stagehand-dev/shared_invite/zt-38khc8iv5-T2acb50_0OILUaX7lxeBOg) before starting to ensure that your contribution aligns with our goals.
+> We highly value contributions to Stagehand! For questions or support, please join our [Slack community](https://stagehand-dev.slack.com) or [Discord](https://discord.com/invite/stagehand).
+At a high level, we're focused on improving reliability, speed, and cost in that order of priority. If you're interested in contributing, we strongly recommend reaching out to [Miguel Gonzalez](https://x.com/miguel_gonzf) or [Paul Klein](https://x.com/pk_iv) in our [Slack community](https://stagehand-dev.slack.com) before starting to ensure that your contribution aligns with our goals.
 
 <!-- For more information, please see our [Contributing Guide](https://docs.stagehand.dev/examples/contributing). -->