Update examples to used gazebosim

[nkoenig]

Signed-off-by: Nate Koenig [email protected]

🦟 Bug fix

Summary

Use gazebosim.org in the example worlds. This also updates a few deprecated uses of ignition-gui and API documentation links.

Merge after the garden release.

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

Merging #1726 (247360b) into gz-sim7 (0df8e9e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           gz-sim7    #1726   +/-   ##
========================================
  Coverage    63.93%   63.93%           
========================================
  Files          334      334           
  Lines        26333    26333           
========================================
  Hits         16836    16836           
  Misses        9497     9497           

Impacted Files	Coverage Δ
include/gz/sim/EntityComponentManager.hh	100.00% <ø> (ø)

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[mjcarroll]

LGTM, is this being held to patch release 1?