Updated cert-manager install to match current documentation

[junkiebev]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
Update getting started documentation regarding the cert-manager install as installCRDs=true has been deprecated.

Special notes for your reviewer:

TODOs:

• squashed commits
• includes documentation
• adds unit tests
• cherry-pick candidate

Release note:

Updated documentation pertaining to the cert-manager installation.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: junkiebev / name: Jeff Kolb (d4f03b6, cb51635)

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @junkiebev. Thanks for your PR.

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[nawazkh]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: f137e2b5c3031574987e6797a77b5b5344441f94

[nawazkh]

/ok-to-test

[nawazkh]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nawazkh

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