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In support of elastic/observability-docs#4230
In elastic/observability-docs#4230 I noticed that page subheadings in deeply-nested pages weren't working as expected. The highest heading level I found was h10, but in this PR I added logic for up to h12. Here's an example of before/after this PR:
(
h10
, no formatting)(
h3
, with formatting)Note: Headings beyond
h6
are not technically valid HTML tags, but the build system will create them so we should handle them appropriately.