Update HTML table headings to lose _

[durack1]

We currently have table headings such as default_sort_index, publication_status, comment_post_publication which are making the parsed table very wide (thinking a bit about this, why do we even have a default_sort_index in the table?, and while we're tweaking things, we may want to think about the column ordering, plus making URLs active, and standardizing the DOI formats (losing the https://doi.org prefix when we can), plus making them live links too.

It would be great to txt.replace("_", " ") these entries across all tables, so column width is more naturally defined, also allowing the current embeds (see the CMIP7 Forcing Datasets page) for a clunky, yet accurate to the latest info example.

There may also be the opportunity of syncing the fonts by mapping these HTML files to use the same CSS stylesheets - https://github.com/WCRP-CMIP/mipcvs-wiki/blob/main/docs/stylesheets/extra.css#L1 - but that is a flourish, and not essential work at all

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