Ignition -> Gazebo

[jennuine]

🦟 Bug fix

Part of:

• Increase test coverage gz-sim#1575
• Rename Ignition to Gazebo gazebo-tooling/release-tools#698

Summary

Updated links and naming in README.md

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (ign-sensors3@1eb8a63). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head 8913878 differs from pull request most recent head 7f611c3. Consider uploading reports for the commit 7f611c3 to get more accurate results

@@               Coverage Diff               @@
##             ign-sensors3     #245   +/-   ##
===============================================
  Coverage                ?   77.57%           
===============================================
  Files                   ?       23           
  Lines                   ?     2377           
  Branches                ?        0           
===============================================
  Hits                    ?     1844           
  Misses                  ?      533           
  Partials                ?        0           

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