Adding a render hook to Hugo generation

[lapentad]

Based on this comment
This will make MD cross reference links work in both Github and Hugo rendered page.
And Images showing in both.

Note the link at the bottom
Before:

After:

Note the image:

[lapentad]

@CsatariGergely

[efiacor]

/assign @CsatariGergely

[nephio-prow]

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/assign @CsatariGergely

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[CsatariGergely]

/assign @liamfallon
/assign @tliron

Please review this and get this merged.

Without this our links are broken in the docs site.

[gvbalaji]

Thanks @lapentad and @CsatariGergely .
/approve
@radoslawc after we merge this, can we move the 2.0.0 tag to this commit.
/assign @radoslawc

[efiacor]

/approve

[nephio-prow]

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[efiacor]

/lgtm