Update README.md

Author: codecademy-docs

README.md

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+<div align="center">
+  <strong>:warning: Contribution Status Update</strong><br>
+    Community contributions to Codecademy Docs are now closed.
+</div>
+<br>
+Codecademy Docs remains live and publicly accessible; however, we are no longer reviewing or merging external pull requests.
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+
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+We are incredibly grateful to the community members who contributed their time and expertise to help build Docs into what it is today.
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 <div align="center">
   <h1>📕 Docs</h1>