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HTML nested lists need to have the sublists contained within the parent <li>. This PR changes the TOC generation to perform this nesting, as well as to detect the highest heading level (so as not to generate an empty H1 entry if the page contains no H1 headings).
Before this PR, note how the numbering is strange (because the <ol> tags are not contained within the list item, so essentially numbering is reset to 1 whenever an <ol> tag is seen, instead of nesting):
After this PR, the problem is fixed: