cert-manager installation using argocd

[shahkv95]

Preview: https://deploy-preview-1350--cert-manager-website.netlify.app/docs/installation/continuous-deployment-and-gitops/#using-argocd

Linked issue: https://github.com/cert-manager/cert-manager/issues/4114

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[shahkv95]

@jsoref @wallrj have addressed and updated the PR with necessary changes in accordance with the comments.

Can you resolve the comments if you are good with it? Thank you!

[matthiashaasesourceforge]

what's going on here ? what's the status ?

[wallrj]

@shahkv95 I don't have permission to push to your branch, so I've pushed your commits to my own branch, rebased and addressed my latest code review comments there:

• https://github.com/cert-manager/website/pull/1447

I'll close this PR and we can continue the work there.