Remove Tackle from Prow Deployment guide

[jihoon-seo]

• Supersedes & closes remove tackle from getting started guide #24
  (which is a translation of Remove tackle from prow getting started guide kubernetes/test-infra#26754)
• We have 2 options here for this PR:
  • We might cherrypick the first commit ('Remove Tackle from Prow Deployment guide') only,
    since the tackle tool is not actively maintained and thus not really supported.
  • Or, although the tool is not actively maintained and thus not really supported,
    we might preserve the doc for tackle.
    (If we choose this option, then it would be good to change the PR title, as it will become the commit message of squashed commit on main branch.)

FYI:
From my experience of deploying Prow 1) using tackle, and 2) manually,

• the Prow depolyment guide instructs to create and configure GitHub App,
  tackle created a webhook to my GitHub org, instead of configuring the webhook of the GitHub App that user just created.
• ... (Some other inconsistency with the guide might exist.)

/label tide/merge-method-squash

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[jihoon-seo]

nit

Suggested change

	## Deploying prow
	## Deploying Prow

[listx]

/lgtm
/approved
/hold

Remove hold when ready.

[jihoon-seo]

/unhold

[jihoon-seo]

@listx Oh you commented /approved command, not /approve, in turn Prow did not added approved label.. 😅

[petr-muller]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jihoon-seo, petr-muller

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[listx]

@listx Oh you commented /approved command, not /approve, in turn Prow did not added approved label.. 😅

Indeed... sorry about that!