[docs] Remove ingress-nginx references in docs and scripts jinja template

[jmeza-xyz]

What type of PR is this?

/kind documentation

What this PR does / why we need it:
Removes ingress-nginx references from the docs
Which issue(s) this PR fixes:

Fixes #12712

Special notes for your reviewer:
None
Does this PR introduce a user-facing change?:

cleanup: remove ingress-nginx from documentation

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

Hi @jmeza-xyz. Thanks for your PR.

I'm waiting for a github.com member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[tico88612]

/kind documentation
/hold
until 2.30.0 release.

[tico88612]

IMO, this PR should just be merged into #12767, unless you have any other better reason.

[yankay]

/ok-to-test

[VannTen]

#12768 (comment)

Agree to that, there is not really a reason to separate the two

[jmeza-xyz]

@tico88612 @VannTen Separated them to make it easier to review but can certainly merge it into the other PR. I'll do that later today and close this one.