Update development documentation

[ReToCode]

Changes

• 🧹 Update development documentation to match changes in Simplify e2e scripts & support contour #414
• 🧹 Drop --skip-teardowns as it is deprecated (https://github.com/knative/hack/blob/main/e2e-tests.sh#L168)
• 🧹 Update .gitignore to not track downloaded istio folder

/kind cleanup
/kind documentation

[knative-prow]

Welcome @ReToCode! It looks like this is your first PR to knative-sandbox/net-gateway-api 🎉

[knative-prow]

Hi @ReToCode. Thanks for your PR.

I'm waiting for a knative-sandbox 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[ReToCode]

/cc @nak3 , @dprotaso

[codecov]

Codecov Report

Merging #433 (07e181f) into main (fa956de) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #433   +/-   ##
=======================================
  Coverage   72.76%   72.76%           
=======================================
  Files           9        9           
  Lines         683      683           
=======================================
  Hits          497      497           
  Misses        157      157           
  Partials       29       29           

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[nak3]

github action job complains about it.
https://github.com/knative-sandbox/net-gateway-api/actions/runs/3910487698/jobs/6683808769
Is it possible to fix this?

LGTM other than that.

[nak3]

/ok-to-test

[nak3]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nak3, ReToCode

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