chore: use npm scripts; update README & CONTRIBUTING guide

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Coverage Summary

Status	Category	Percentage	Covered / Total
🔵	Lines	24.4%	765 / 3134
🔵	Statements	24.4%	765 / 3134
🔵	Functions	35.87%	47 / 131
🔵	Branches	65.97%	128 / 194

File Coverage

File	Stmts	% Branch	% Funcs	% Lines	Uncovered Lines
src/array-partition.ts	50%	100%	0%	50%	7-12
src/async.ts	94.69%	100%	85.71%	94.69%	89-94
src/datetime.ts	100%	100%	100%	100%
src/debounce.ts	100%	100%	100%	100%
src/delay.ts	100%	100%	100%	100%
src/drag.ts	27.65%	100%	0%	27.65%	14-47
src/introspector.ts	20%	50%	50%	20%	6-16, 22-50
src/ls.ts	100%	100%	100%	100%
src/once.ts	100%	100%	100%	100%
src/pipe.ts	100%	100%	100%	100%
src/purity.ts	99.09%	97.77%	100%	99.09%	135-136
src/router.ts	100%	100%	75%	100%
src/sanitize.ts	100%	100%	100%	100%
src/selection-insert.ts	25%	100%	0%	25%	3-8
src/visibility-sensor.ts	0%	0%	0%	0%	1-55
src/examples/async-search/app.ts	0%	0%	0%	0%	1-10
src/examples/async-search/helpers.ts	0%	0%	0%	0%	1-42
src/examples/async-search/types.ts	0%	0%	0%	0%	1-12
src/examples/async-search/ui/chosen-items.ts	0%	0%	0%	0%	1-22
src/examples/async-search/ui/error-banner.ts	0%	0%	0%	0%	1-23
src/examples/async-search/ui/root_.ts	0%	0%	0%	0%	1-36
src/examples/async-search/ui/spinner_.ts	0%	0%	0%	0%	1-19
src/examples/async-search/ui/suggestions-list.ts	0%	0%	0%	0%	1-25
src/examples/async-todo-example/api.ts	0%	0%	0%	0%	1-26
src/examples/async-todo-example/app.ts	0%	0%	0%	0%	1-20
src/examples/async-todo-example/ui/App.ts	0%	0%	0%	0%	1-32
src/examples/async-todo-example/ui/InputForm.ts	0%	0%	0%	0%	1-51
src/examples/async-todo-example/ui/List.ts	0%	0%	0%	0%	1-29
src/examples/async-todo-example/ui/ListItem.ts	0%	0%	0%	0%	1-61
src/examples/async-todo-example/ui/Spinner.ts	0%	0%	0%	0%	1-9
src/examples/async-todo-example/ui/StatefulCounter.ts	0%	0%	0%	0%	1-73
src/examples/async-todo-example/ui/onMount.ts	0%	0%	0%	0%	1-17
src/examples/async-todo-example/ui/useState.ts	0%	0%	0%	0%	1-8
src/examples/colored-input-example/main.ts	100%	100%	100%	100%
src/examples/counter/main.ts	100%	100%	100%	100%
src/examples/multiple-event-handlers/main.ts	0%	0%	0%	0%	1-18
src/examples/purity-todo/app.ts	92.53%	0%	100%	92.53%	58-62
src/examples/purity-todo/env.ts	0%	0%	0%	0%	1-10
src/examples/purity-todo/components/app-style.ts	15.87%	100%	0%	15.87%	6-58
src/examples/purity-todo/components/header.ts	0%	0%	0%	0%	1-42
src/examples/purity-todo/components/input-form.ts	0%	0%	0%	0%	1-71
src/examples/purity-todo/components/modal-style.ts	0%	0%	0%	0%	1-60
src/examples/purity-todo/components/modal.ts	0%	0%	0%	0%	1-27
src/examples/purity-todo/components/nav-item.ts	0%	0%	0%	0%	1-30
src/examples/purity-todo/components/root.ts	0%	0%	0%	0%	1-46
src/examples/purity-todo/components/settings.ts	0%	0%	0%	0%	1-52
src/examples/purity-todo/components/subtask-item.ts	0%	0%	0%	0%	1-79
src/examples/purity-todo/components/task-details-style.ts	0%	0%	0%	0%	1-72
src/examples/purity-todo/components/task-details.ts	0%	0%	0%	0%	1-155
src/examples/purity-todo/components/task-item.ts	81.01%	100%	40%	81.01%	10-14, 19-23, 28-32
src/examples/purity-todo/components/task-list-style.ts	0%	0%	0%	0%	1-56
src/examples/purity-todo/components/task-list.ts	0%	0%	0%	0%	1-37
src/examples/purity-todo/components/version.ts	0%	0%	0%	0%	1-22
src/examples/purity-todo/config/google-api.ci.ts	0%	0%	0%	0%	1-10
src/examples/purity-todo/config/google-api.prod.ts	0%	0%	0%	0%	1-10
src/examples/purity-todo/config/images.ts	100%	100%	100%	100%
src/examples/purity-todo/services/error.ts	0%	0%	0%	0%	1-4
src/examples/purity-todo/services/google-api.ts	0%	0%	0%	0%	1-65
src/examples/purity-todo/services/image-processing.ts	0%	0%	0%	0%	1-78
src/examples/purity-todo/services/images.ts	0%	0%	0%	0%	1-45
src/examples/purity-todo/services/input-form.ts	0%	0%	0%	0%	1-8
src/examples/purity-todo/services/settings.ts	0%	0%	0%	0%	1-45
src/examples/purity-todo/services/storage.ts	50%	50%	50%	50%	17-35
src/examples/purity-todo/services/task-details.ts	47.61%	100%	0%	47.61%	7-13, 16-18, 21
src/examples/purity-todo/services/tasks.ts	36.36%	100%	0%	36.36%	8, 11-26, 29-38, 41-43, 47-51, 55-60, 66
src/examples/purity-todo/services/text-file-manager.ts	0%	0%	0%	0%	1-27
src/examples/router/main.ts	100%	100%	100%	100%
src/examples/simple-todo-example/app.ts	0%	0%	0%	0%	1-17
src/examples/simple-todo-example/helpers.ts	0%	0%	0%	0%	1-4
src/examples/simple-todo-example/types.ts	0%	0%	0%	0%	1-5
src/examples/simple-todo-example/ui/InputForm.ts	0%	0%	0%	0%	1-43
src/examples/simple-todo-example/ui/ListItem.ts	0%	0%	0%	0%	1-30
src/examples/simple-todo-example/ui/Root.ts	0%	0%	0%	0%	1-17
src/examples/use-state-example/Button.ts	0%	0%	0%	0%	1-20
src/examples/use-state-example/Root.ts	0%	0%	0%	0%	1-10
src/examples/use-state-example/StatefulCounter.ts	0%	0%	0%	0%	1-24
src/examples/use-state-example/useState.ts	0%	0%	0%	0%	1-21
src/playground/components/editor-style.ts	0%	0%	0%	0%	1-14
src/playground/components/editor.ts	0%	0%	0%	0%	1-23
src/playground/components/playground-style.ts	0%	0%	0%	0%	1-79
src/playground/components/playground.ts	0%	0%	0%	0%	1-44
src/playground/components/view.ts	0%	0%	0%	0%	1-43
src/playground/services/code-sample.ts	0%	0%	0%	0%	1-15
src/playground/services/monaco-editor-config.ts	0%	0%	0%	0%	1-61
src/playground/services/storage.ts	0%	0%	0%	0%	1-3
src/playground/services/user-code.ts	0%	0%	0%	0%	1-18