posts: Rewrite and improve 'Duly noted' section in signify-cgit.md

This commit attempts to clarify what exactly a tree is, and how trees
used for notes relate to "regular" trees. To that end, include real-life
examples and output from commands run in a repository that is publicly
accessible (in this case, quarg). This allows people who are interested
in the internals to follow along and poke around in the repository
themselves.

Many thanks to V for initial feedback and motivation for this change.

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