en,zh: remove docs about tidb-binlog and tikv-importer

[csuzhangxc]

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• v1.4 (TiDB Operator 1.4 versions)
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[csuzhangxc]

these charts have been removed before

[Oreoxmt]

/cc @Oreoxmt

[Oreoxmt]

Please update the base branch for this PR from master to release-1.x, as release-1.x is now the active development branch for TiDB Operator v1.x documentation.