Fix Hugo relref references to work in md

[liamfallon]

This PR fixes the "ref" and "relref" links in the documentation so that they work in Markdown and thus Github. This will mean the links will not work in the Hugo documentation.

We need to figure out a way to get the links working in both but they really should work in Github.

The links are now all absolute links in order to pass linkspector and to work in md.

The linkspector tool fails on any link with a '#' in it, that is a link to a tag in any document. The change to the .linkspector file is to remove the '#' character and any following text, thus allowing those links to pass linkspector.

[liamfallon]

/retest

[liamfallon]

/assign @CsatariGergely @tliron @efiacor

[nephio-prow]

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In response to this:

/assign @CsatariGergely @tliron @efiacor

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[radoslawc]

/lgtm

[CsatariGergely]

Wow, this is really cool, in this way the links are working in GitHub also. I was not aware that this is doable. I've checked locally and it compiles nicely.
/lgtm

[nephio-prow]

@CsatariGergely: changing LGTM is restricted to collaborators

In response to this:

Wow, this is really cool, in this way the links are working in GitHub also. I was not aware that this is doable. I've checked locally and it compiles nicely.
/lgtm

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[efiacor]

/approve
/lgtm

[nephio-prow]

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