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to get the node ordering functionality.

this has been inadvertently copied from francearchive and has nasty side effect since
it also remove a wrapper that makes the js code called once the page is fully loaded.

Since it's required to run a sherpa instance.

it may not be /, so properly build the url as done for the SIAF logo.

Closes #17084052

using text and image specified by the SIAF.

using text and image provided by the SIAF

as provided by the SIAF.

using image provided by the SIAF. Page was already (erroneously) referenced from
the template.

as specified by the SIAF

as provided by the SIAF

So it can be checked by CI

Fix former-warning-now-error in sphinx configuration which expect static dirs to
exist.