First cut of book documentation.

[azriel91]

Closes #22.

[codecov]

Codecov Report

Merging #23 (3d49b08) into main (4dbc092) will decrease coverage by 1.33%.
The diff coverage is 94.98%.

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
- Coverage   93.07%   91.74%   -1.34%     
==========================================
  Files          56       56              
  Lines        2341     2375      +34     
==========================================
  Hits         2179     2179              
- Misses        162      196      +34     

Impacted Files	Coverage Δ
crate/resources/src/item_spec_rt_id.rs	0.00% <ø> (ø)
crate/resources/src/resources.rs	82.50% <ø> (ø)
crate/resources/src/resources_type_state.rs	0.00% <ø> (ø)
workspace_tests/src/lib.rs	100.00% <ø> (ø)
crate/item_spec_id_macro/src/lib.rs	68.00% <50.00%> (ø)
crate/resources/src/internal/op_check_statuses.rs	50.00% <60.00%> (ø)
crate/rt/src/commands/ensure_cmd.rs	63.73% <66.66%> (-32.94%)	⬇️
crate/rt_model/src/item_spec_wrapper.rs	82.89% <83.33%> (ø)
crate/core/src/item_spec_id.rs	100.00% <100.00%> (ø)
crate/core/src/item_spec_id_invalid_fmt.rs	100.00% <100.00%> (ø)
... and 35 more

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