v0.8.0: Adjust lint rules; upgrade dependencies

🚀 External changes

• Exempt mocks and tests from lint rule react/jsx-no-literals.
• Fortify lint rule no-underscore-dangle by prohibiting dangling underscores in destructured array and object members.

🏠 Internal changes

• Add JavaScript configuration via jsconfig.json.

🧹 Chores

• Implement environment variables in npm scripts to reduce repetition.
• Upgrade dependencies.