Update README

[iche033]

🦟 Bug fix

Summary

• Changed Focal CI badge to Jammy (I had to enable the project on jenkins)
• Update links
• Renamed ogre 2.x to ogre-next 2.x

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 #907 (4892388) into gz-rendering8 (0795e09) will increase coverage by 0.03%.
The diff coverage is n/a.

❗ Current head 4892388 differs from pull request most recent head 69bf014. Consider uploading reports for the commit 69bf014 to get more accurate results

@@                Coverage Diff                @@
##           gz-rendering8     #907      +/-   ##
=================================================
+ Coverage          75.18%   75.21%   +0.03%     
=================================================
  Files                177      176       -1     
  Lines              16846    16839       -7     
=================================================
  Hits               12665    12665              
+ Misses              4181     4174       -7     

see 11 files with indirect coverage changes