Hide key-line created by `markdown-it-footnote` template when footnotes are directly preceded by header.
Examples:
```md
# References
[^1]: Shows no key-line because References header has one already
# New Page
Text goes here and whatever else
[^1]: these footnotes have no preceding header and will show a key-line
```
* Header formatting for Details Summary
Cleaning up Headers within Details Summary
* Fix for TOC Anchor location
Fix for TOC Anchor location within Details Summary
* display: none for the keyline seems smarter
* Fixes to accommodate large summaries
Fixed to accommodate larger summaries containing both headers and phrasing text. Still removing keylines for summaries with ONLY a header.