feat(HTML): Export formulas with mathml

[dolfim-ibm]

feat(HTML): Allow the export of formulas as mathml
feat(HTML): Retain the original latex using html standards
fix(HTML): Keep newlines in pre blocks

Chore:

• Rework the sanitize function and move newline cleanup in there
• Remove functions which would never be executed (because the labels logic changed)

Open questions:

1. Should this be the default?
2. Should the new dependency always be there or as extras?

[mergify]

Merge Protections

Your pull request matches the following merge protections and will not be merged until they are valid.

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• title ~= ^(fix|feat|docs|style|refactor|perf|test|build|ci|chore|revert)(?:\(.+\))?(!)?:

🟢 Require two reviewer for test updates

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When test data is updated, we require two reviewers

• #approved-reviews-by >= 2

[PeterStaar-IBM]

Let's go!! 🚀