Installation guide for airgapped environments

[omri-matari]

Describe the feature

Customers in a disconnected environment require an installation guide on how to install knative serving in an airgapped environment. Include all the required packages, images and installation procedure.

[sahil5206]

Do we need to write some Documentation or anything else as you mentioned kind/feature tag.

[omri-matari]

Yes, documentation for airgapped installations could be great.

[sahil5206]

that's awesome to listen.
so could i go ahead with this.
You can assign it to me.

[sahil5206]

i have made a PR, You can see the work where i have made a documentation in the "docs" directory named as "airgapped-installation-guide.md".
i hope you will like, if you want some other changes, feel free to tell me.

[dprotaso]

I'm moving this issue to the docs repo so that this ends up being on the website where it's most relevant to people there