docs: make banner color less aggressive (#8902)

Author: lnhsingh

docs/core_docs/docusaurus.config.js

@@ -148,7 +148,7 @@ const config = {
       announcementBar: {
         content:
           "These docs will be deprecated and no longer maintained with the release of LangChain v1.0 in October 2025. <a href='https://docs.langchain.com/oss/javascript/langchain/overview' target='_blank'>Visit the v1.0 alpha docs</a>",
-        backgroundColor: "#CC5500",
+        backgroundColor: "FFAE42",
       },
       prism: {
         theme: {