Update Documenter 1.4.0 => 1.8.0 #56538
                
     Merged
            
            
          
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Includes a bunch small change, but importantly the fix for the search not opening.
I think we should also backport this to 1.10 and 1.11, but those should probably be done manually, to avoid manifest conflicts. Should I just PR the relevant
release-*branches?