chore: subtree-merge STLShopBook mdbook source (history preserved)

The ShopBook manual source (src/, book.toml, 23 commits of history) now
lives under shop-manual-src/. Content migration to Grav pages follows.

https://projects.knownelement.com/issues/928
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2026-09-07 11:26:22 -05:00
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# Version history
v1.0 10/23/2023