Technical updates to front page "version line"

[larsbarring]

See issue #XXX for discussion of these changes.
This PR, which has no associated issue, is intended to do two things:

• Activate the html link to https://cfconventions.org in the "version line" (below author list) of the html document.
• Change the spaces in the text related to the same html link to non-breaking spaces so that a possible line break in the pdf version does not chop up the text (this should have been done already in PR#464.

Release checklist

• Authors updated in cf-conventions.adoc?
• Next version in cf-conventions.adoc up to date? Versioning inspired by SemVer.
• history.adoc up to date?
• Conformance document up-to-date?

For maintainers

After the merge remember to delete the source branch.
Tags are set at the conclusion of the annual meeting; until then, main always is a draft for the next version.

[larsbarring]

This is a purely technical and formatting PR. It builds on PR #475 and needs to be updated as soon as that one is merged. Because it does not aftect the content in any way, it should be possible to merge this one as soon as it has been established that it does what is intended.

[larsbarring]

The result of these changes can be checked by downloading the zipped documents that resultsw from the gh action. These are available from this link. Essentially, here are screen captures of the changes:

Current version html:

New version html:

Current version pdf:

New version pdf:

[larsbarring]

@davidhassell could you have a final look and merge if nothing comes up.

[davidhassell]

Hi Lars, is the file generated in https://github.com/cf-convention/cf-conventions/actions/runs/7005988899 the most up to date? It has some rogue <, >:

When I run the sed locally, I don't see them.

[larsbarring]

OK, the < > are now removed. And I have just checked the produced artefacts and they look good.

[larsbarring]

And now using sed back-reference correctly. Artefacts still looks ok.