Reconfigure v3.0.0-alpha.2

• Tidy .gitignore. Closes #92.
• Replace deep-equal with fast-deep-equal. Closes #91.
• Tidy package.json. Closes #90.
• Revert test to Proof. Closes #89.
• Notes on and tests of partially written files. Closes #88.
• Create test to evaluate watching of copies. See #88.
• Add badges for Actions, Codecov and license. Closes #87. Closes #86. Closes #85.
• Build with Actions, ship coverage to Codecov. Closes #84. Closes #83.

Closes #93.