Fix old link to envtest docs that should have been removed

[gabbifish]

This PR fixes #1621, which was caused by an old sidebar link that should have been deleted as part of moving the integration test example under the CronJob example section.

[k8s-ci-robot]

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[camilamacedo86]

Hi @gabbifish,

Really nice, following some nits.

• The link in https://deploy-preview-1624--kubebuilder.netlify.app/cronjob-tutorial/writing-tests.html shows not rigfht. See:

The name of the section is: Configuring envtest for integration tests. So, we need to update that.

• Also, in the submenu after this change:

IMO it needs to be changed to be like the others. Maybe Configuring EnvTest. WDYT?

[gabbifish]

Ooh, great catches! I addressed both bullet points--let me know what you think!

[camilamacedo86]

/ok-to-test

[camilamacedo86]

/approved

👍 it shows great for me

[camilamacedo86]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: camilamacedo86, gabbifish

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[camilamacedo86]

/lgtm

[camilamacedo86]

Hi @gabbifish,

Could you rebase with the master and squash the commits for we are able to merge this one?

/lgtm cancel

[gabbifish]

@camilamacedo86 rebased on master and squashed!

[camilamacedo86]

/lgtm