[chore] update links in readme for slack and rm npm pill (#455)

* Update README.md

* Update README.md

Author: kamath

README.md

@@ -15,19 +15,13 @@
 </p>
 
 <p align="center">
-  <a href="https://www.npmjs.com/package/@browserbasehq/stagehand">
-    <picture>
-      <source media="(prefers-color-scheme: dark)" srcset="https://stagehand.dev/api/assets/npm?mode=dark" />
-      <img alt="NPM" src="https://stagehand.dev/api/assets/npm?mode=light" />
-    </picture>
-  </a>
   <a href="https://github.com/browserbase/stagehand/tree/main?tab=MIT-1-ov-file#MIT-1-ov-file">
     <picture>
       <source media="(prefers-color-scheme: dark)" srcset="https://stagehand.dev/api/assets/license?mode=dark" />
       <img alt="MIT License" src="https://stagehand.dev/api/assets/license?mode=light" />
     </picture>
   </a>
-  <a href="https://join.slack.com/t/stagehand-dev/shared_invite/zt-2tdncfgkk-fF8y5U0uJzR2y2_M9c9OJA">
+  <a href="https://stagehand.dev/slack">
     <picture>
       <source media="(prefers-color-scheme: dark)" srcset="https://stagehand.dev/api/assets/slack?mode=dark" />
       <img alt="Slack Community" src="https://stagehand.dev/api/assets/slack?mode=light" />
@@ -143,4 +137,4 @@ We'd like to thank the following people for their contributions to Stagehand:
 
 Licensed under the MIT License.
 
-Copyright 2025 Browserbase, Inc.
+Copyright 2025 Browserbase, Inc.