tools/docs: change docs tool to work with ignition
tools/docs: change docs tool to work with ignition

Change clct's docs validator to work with Ignition. Disable validation
of snippets and ignore v1 deprecation warnings.

coreos/ignition,ajeddeloh/ignition,ajeddeloh/ignition,dgonyeo/ignition,coreos/ignition,coreos/ignition,dgonyeo/ignition,dgonyeo/ignition,ajeddeloh/ignition