Align heading style with subheadings in markdown
Description
Our syntax highlighting themes have inconsistent differentiation between first level headings and subheadings in markdown. Lines that start with # sometimes look like comments, sometimes like subheadings`.
https://twitter.com/mariatta/status/1364695928926478338
This MR aligns all headings (#) to have the same style as subheadings (##), as that's also the style that's used in the "Edit" mode.
Screenshots
White
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Dark
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Solarized Light
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Solarized Dark
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Monokai
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None
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Edited by Marcel van Remmerden