[ign ➡️ gz] Logo, docs, tools

[chapulina]

• Part of ign to gz: UI, API docs gazebo-tooling/release-tools#728
• Goes with Install desktop entry gazebo-release/gz-sim7-release#8

Summary

• Logo on Ubuntu
• Docker
• Remaining docs (including API, tutorials, examples, tests)

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• 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 #1517 (f525702) into main (2e141c2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1517   +/-   ##
=======================================
  Coverage   63.62%   63.62%           
=======================================
  Files         330      330           
  Lines       25784    25784           
=======================================
  Hits        16405    16405           
  Misses       9379     9379           

Impacted Files	Coverage Δ
include/gz/sim/Util.hh	100.00% <ø> (ø)
include/gz/sim/gui/GuiSystem.hh	0.00% <ø> (ø)
include/gz/sim/rendering/SceneManager.hh	100.00% <ø> (ø)
src/Server.cc	89.72% <ø> (ø)
src/Util.cc	92.53% <ø> (ø)
src/gui/plugins/modules/EntityContextMenu.cc	19.78% <ø> (ø)
src/gui/plugins/spawn/Spawn.cc	10.27% <ø> (ø)
.../gui/plugins/transform_control/TransformControl.cc	7.37% <ø> (ø)
...lization_capabilities/VisualizationCapabilities.cc	3.69% <ø> (ø)
src/rendering/MarkerManager.cc	13.02% <ø> (ø)
... and 29 more

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[methylDragon]

Note that we'll need to rebase since files have moved