tuteng opened a new pull request #5700: Update document for developer and old version URL: https://github.com/apache/pulsar/pull/5700 ### Motivation At present, in official documents, due to changes in the document structure and the limitation of docusaurus framework, the old version of the document cannot be deleted, only the name of the document can be changed so that there are many duplicate contents. when contributors want to modify the content of the document, they do not know where to modify it or need to modify several places, which is very unfriendly to developers. ### Modifications * Keep the title of the document of the old version, delete the content, and ensure that the old version can find the matching content. ### Verifying this change yarn build pass
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