User guide for istioctl managing webhooks (#5162)
User guide for istioctl managing webhooks (#5162)

* User guide for istioctl managing webhooks

* Generate the webhook configurations

* Skip long config

* Move the task to be under setup/install directory

* Add jq as a prerequisite

* Decouple installation from the user guide

* Add explanations to config

* Change the weight

* Revisions on cleanup

* Revise headings

* Revise the search instructions

* Revise the wordings

* Revise install instructions and location

* Skip --validation

* Use istioctl to generate webhook configurations

* Use istioctl to install

* Revise the commands

* Revise the wording

* Remove two comment lines

istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io