Fix invalid or obsolete HTML (post scriptum) #216
Merged
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Sorry, missed that one in #215, since it is embedded in a mixture of html and jekyll liquids here: https://github.com/music-encoding/music-encoding.github.io/blob/master/_includes/menu-accordion.html#L26-L30
UL cannot be directly nested into another UL, but only as a child of LI (cf. https://developer.mozilla.org/en-US/docs/Learn/HTML/Introduction_to_HTML/HTML_text_fundamentals#nesting_lists).
@bwbohl Could you please double-check for any potential CSS issues?