📝 Remove GitPod and add link to GitHub codespaces

[homersimpsons]

Fixes #2678

[YJDoc2]

Thanks for opening the PR!
May I ask you to sign off your commit : https://github.com/containers/youki/pull/2717/checks?check_run_id=22180998348

[homersimpsons]

May I ask you to sign off your commit : https://github.com/containers/youki/pull/2717/checks?check_run_id=22180998348

Done ✅

[homersimpsons]

There are 2 failures:

• https://github.com/containers/youki/actions/runs/8115770123/job/22198746318?pr=2717: I do not know how I can apply a label to this Pull Request (looks like I cannot edit them, and it does not seem like there is a bot command to apply it). The label should be kind/documentation
• https://github.com/containers/youki/actions/runs/8115770130/job/22198775533?pr=2717: I did not change anything beside the documentation so I do not know how this can fail. Looking at the job log it is unclear to me what is failing, mabe it is this line "Running process_rlimits/process_rlimits.t" but I cannot be sure as there are no "success" message.

[YJDoc2]

lgtm

[YJDoc2]

Thanks @homersimpsons !

I'll go ahead and merge it, as there are no code changes, and the pending CI checks are for tests etc.