new nav release-6.5: remove develop guide, releases, and best practices from TOC.md#22405

qiancai wants to merge 2 commits intopingcap:release-6.5pingcap/docs:release-6.5from

qiancai:v6.5/update-links-for-new-navqiancai/docs:v6.5/update-links-for-new-navCopy head branch name to clipboard