Update README.md

[nodeg]

Description

This PR updates and aligns the README with the one from cucumber-ruby the following way:

• Adds the proper Cucumber logo
• Adds the #StaneWithUkraine label
• Removes the 2 broken labels (issues, pull requests, see https://github.com/oselvar/oselvar-github-metrics/issues/5)
• Remove Ruby < 3.0 from the list of supported Ruby versions
• un-centers the Gherkin Cucumber Example picture like the main cucumber-ruby README

Rendered version can be found here.

Type of change

README only.

Note to other contributors

None.

Checklist:

Your PR is ready for review once the following checklist is complete. You can also add some checks if you want to.

• [x] Tests have been added for any changes to behaviour of the code
• [x] New and existing tests are passing locally and on CI
• [x] bundle exec rubocop reports no offenses
• [x] RDoc comments have been updated
• [x] CHANGELOG.md has been updated