feat: update doc links to kubefirst.konstruct.io/docs

[muse-sisay]

Description

Update doc links from https://docs.kubefirst.io/ to https://kubefirst.konstruct.io/docs/

Related Issue(s)

How to test

Run the following command in the current branch

$ go run main.go --help
kubefirst management cluster installer provisions an
	open source application delivery platform in under an hour.
	checkout the docs at https://kubefirst.konstruct.io/docs/.