fix: Mermaid diagram rendering in Reveal slides

[malmarz]

This is an improved fix for improperly rendering mermaid diagrams in Reveal slides if included beyond the 3rd slide.

It also includes update to latest version of mermaid.

Please note the patch has not tested

As it's been a while since I setup a wowchemy dev environment. With no clear instruction or easy path to do so, the hassle is too great for me for such a simple and useful patch. So I would rather at least the community know of this fix and incorporate it if someone can easily test it.

The discussion on this fix from the Reveal repo can be found here:
hakimel/reveal.js#2863 (comment)

I hope it works and you all find it useful

Many thanks for the great effort

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[malmarz]

ok managed to test the patch by:
1- running the included starter slides and added the missing slides.diagram option in index.md (otherwise the diagrams will not render)
2- used replace directive in go.mod to run the local version

tested a few complex diagrams and all seem to render perfectly

[gcushen]

Unfortunately, no one familiar with Reveal has reviewed the code in this PR yet. However, I understand Rodri tested the PR (via Discord) and found no issues. In the interests of making this improvement available to other users and not lost to merge conflicts, let's merge it and later consider reverting if any issues reported.

P.S. for future reference, please submit a separate PR for each issue (e.g. you bundled a Reveal upgrade into this PR).