Move struct Document inside mod document #61

# to view logs

Job	Run time
Unit tests with minimum versions of direct dependencies (windows-latest)	39s
Unit tests with minimum versions of direct dependencies (macos-latest)	34s
Clippy	14s
Unit tests (windows-latest, stable)	57s
Preflight crate publish (ubuntu-latest, stable)	21s
Unit tests with minimum versions of direct dependencies (ubuntu-latest)	16s
Unit tests (windows-latest, 1.72.0)	54s
Unit tests (macos-latest, stable)	44s
Unit tests (macos-latest, 1.72.0)	42s
Enforce Rust code format	12s
Unit tests (ubuntu-latest, stable)	19s
Unit tests (ubuntu-latest, 1.72.0)	24s
License / vulnerability audit (advisories)	21s
Preflight docs.rs build	14s
License / vulnerability audit (bans licenses sources)	19s
Check for unused dependencies	15s
	7m 25s

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