#1289: Fix broken links

[YoucTagh]

Closes #1289

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We link to Validation Activity, however, it is not defined in Core. What should we do?

[nicholascar]

We link to Validation Activity, however, it is not defined in Core. What should we do?

Add it in this PR...

[scotthenninger]

looks good

[mgberg]

Wait- didn't we intend to replace Processor Configuration with Validation Agent? Did we not do that in Core?

[ajnelson-nist]

Wait- didn't we intend to replace Processor Configuration with Validation Agent? Did we not do that in Core?

In the current gh-pages branch state, Processor Configuration is still the live concept in Core. Validation Agent is not in Core.

[ajnelson-nist]

Validation Activity may need a paragraph in Core.

The Validation Report section includes the line "The RDF graph MAY contain additional provenance metadata." Otherwise, neither provenance nor PROV is mentioned in documentation in Core. (There's a provenance shape example, but it's not pertinent to SHACL provenance definitional matters.)

If we're going to load validation activity and agent into Core, we probably need a section on provenance of validations. Maybe a 6.7.3, following 6.7.x (1 Validation Report, 2 Validation Result)?