docs: remove ACP migration references now that REST backend is complete #37

Job	Run time
typecheck	59s
Rust tests (Windows)	13m 8s
test-js	2m 22s
Rust tests (macOS)	6m 46s
lint	1m 0s
Rust tests (Linux)	8m 23s
Tauri build (${{ matrix.platform.name }})	0s
	32m 38s

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