release: README rework — graph guide, features, usage - #278

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache/restore@0057852bfaa89a56745cba8c7296529d2fc39830, actions/cache/save@0057852bfaa89a56745cba8c7296529d2fc39830, actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5, actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Variable 'R' is declared but never used. Unused variables should start with a '_'.

Identifier 'Exit' is imported but never used.

Identifier 'Cause' is imported but never used.

Identifier 'Icon' is imported but never used.

Variable 'messages' is declared but never used. Unused variables should start with a '_'.

Variable 'diffs' is declared but never used. Unused variables should start with a '_'.

Variable 'platform' is declared but never used. Unused variables should start with a '_'.

Identifier 'createMemo' is imported but never used.

Variable 'platform' is declared but never used. Unused variables should start with a '_'.

Identifier 'produce' is imported but never used.