Run content tests from raku/doc on templates

[coke]

Now that content templates and web-specific pages exist in doc-website, we should run many of the content tests in raku/doc also on raku-doc-website.

We should do this in a way which avoids duplication of the tests and configs (e.g. list of allowed words).

Includes spelling, preferred phrasing, duplicated words, etc.

[finanalyst]

I entirely agree with a division of content and visualisation.
The web-specific pages are in Website/structure-sources/. These are rakudoc / pod6 format. So whatever utilities run on raku/doc will run on raku/doc-website. I suggest that these binaries are all placed in binary-files, rather than create another directory.

[coke]

See Raku/doc#4263

[finanalyst]

I don't see how to do this without some form of duplication of files

Is it possible to put the test utilities in a 'sub-repo' so that both Raku/doc and Raku/doc-website can source the utilities from the same place? Then the utilities can be run in their own work flows.