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It is best to link to pages with e.g. https://ampform.rtfd.io/usage/ (note the final /) instead of https://ampform.rtfd.io/usage or https://ampform.rtfd.io/usage.html. This will correctly redirect to the usage page, whether it uses the dirhtml builder or html builder.
Partially reverts #388 by switching back from the Sphinx
dirhtml
tohtml
(see https://github.com/ComPWA/policy/issues/158). This again results in URLs likehttps://ampform.rtfd.io/usage.html
, but avoid other DX problems, like https://github.com/ComPWA/policy/issues/335 and bad page navigation when opening the files locally.