chore(docs): general improvements and typos

[jbergstroem]

Also: address indent issues in usage examples

[coderabbitai]

Walkthrough

This pull request updates documentation files with textual and formatting corrections. CONTRIBUTING.md capitalizes "Github" to "GitHub" in release steps. README.md adds License MIT and codecov badges, and corrects capitalization across references to "GitHub" and "GitHub Action" throughout the documentation. USAGE.md adjusts YAML indentation in hadolint step examples and fixes typos and phrasing in prose sections. All changes are documentation-focused with no modifications to code logic, error handling, or execution flow.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'chore(docs): general improvements and typos' accurately reflects the changeset, which focuses on documentation updates, typo fixes, and formatting corrections across CONTRIBUTING.md, README.md, and USAGE.md.
Description check	✅ Passed	The description 'Also: address indent issues in usage examples' is directly related to the changeset, specifically highlighting YAML indentation adjustments in USAGE.md that are part of the broader documentation improvements.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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