Brush work

[TheTechromancer]

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[codecov]

Codecov Report

❌ Patch coverage is 79.58057% with 185 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
crates/darkly/src/brush/checkpoint_ring.rs	35.13%	48 Missing ⚠️
crates/darkly/src/bin/sync_docs.rs	0.00%	47 Missing ⚠️
crates/darkly/src/docs_render/mod.rs	65.25%	41 Missing ⚠️
crates/darkly/src/docs_md/mod.rs	91.31%	29 Missing ⚠️
crates/darkly/src/bin/render_docs.rs	0.00%	17 Missing ⚠️
crates/darkly/src/brush/nodes/watercolor.rs	85.71%	1 Missing ⚠️
crates/darkly/src/brush/read_mirror_terminal.rs	85.71%	1 Missing ⚠️
...ates/darkly/src/docs_md/fragments/catalog_table.rs	96.87%	1 Missing ⚠️

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[TheTechromancer]