Adding Flux to the CI/CD Section

[sbernheim]

The CI/CD section of the Trail Map mentions only Argo and leaves out Flux, giving the reader an inaccurate impression that there is only one CNCF CI/CD project.

Please add mention of Flux and the Flux logo to the CI/CD section.

[dholbach]

Yes, we'd love to be represented there as well.

[alexcontini27]

We are going to archive the trail map (no longer using it, so don't need to update). I am in the process of moving it to an archived folder so I will close this issue but let me know if there are any problems!