fix link to codeclimate in docs

[dklimpel]

Checklist

• [x] make test-all (UNIX) passes. CI will also test this
• [x] unit and/or integration tests are included (if applicable)
• [x] documentation is changed or added (if applicable)

Description of change

• Fix copyright year
• typo in github link
• path to codeclimate project

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📚 Documentation preview 📚: https://goss--926.org.readthedocs.build/en/926/

[aelsabbahy]

Is code climate even used, or does golang-ci replace it?

[dklimpel]

Is code climate even used, or does golang-ci replace it?

I do not see any benefit at the moment. Perhaps you se gators about code coverage or something else. I have been never used Codeclimate.