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Added in https://github.com/matrix-org/synapse/pull/16533, this workflow was intended to be run once to add the version picker to all historical versions of the https://matrix-org.github.io/synapse documentation website. Note that the latest version of the docs built from this repo now exist at https://element-hq.github.io/synapse/. The workflow has been run successfully and the version picker was added to the documentation. Thus we can now delete this workflow. --- Note: Do not confuse this PR with https://github.com/matrix-org/synapse/issues/9453. This PR was made while we were populating this repo with "Dummy issues" after the changeover from matrix-org/synapse to element-hq/synapse - therefore referencing this PR may cause some confusion.