Delete static versions of _book.yaml and _project.yaml.

These files are used by devsite only, so are maintained in piper.

bug: 79155333
test: make ds-docs (human review)

Change-Id: I5d5662a2a401872a669dba0916b20a79bcfca7ae
(cherry picked from commit 9e64abe7)

parent 3bc533d2

docs/html/reference/_book.yaml

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File deleted.

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docs/html/reference/_project.yaml

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Original line number	Original line	Diff line number	Diff line
	name: "Reference"
	home_url: /reference/
	description: "API Reference packages and classes."
	content_license: cc3-apache2
	buganizer_id: 30209417
	parent_project_metadata_path: /develop/_project.yaml