feat(backlog): usability improvements, navigation fixes, and github edit buttons

[JHONR2]

Closes #1061, Closes #1072, Closes #552

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[illicitonion]

Hi! Thanks for putting this together!

Can I ask how you tested this? I still reproduce #1072 with your change, and I don't currently see any pages suffering from #1061 before or after this change :)

The fix for #552 looks good - please can you re-style so that there isn't a big triangle before the cog, and it's instead just a cog you can click to expand?