mention disabling built-in for yaml

[davidosomething]

You must disable built-in schemaStore support if you want to use this plugin and its advanced options like ignore.

• to validate this, create a conf.yml file
• it will be registered as a Cheatsheets schema
• disable Cheatsheets using ignore option

observed:

• the conf.yml is still being validated against the Cheatsheets schema

expected:

• conf.yml should have no schema validation

to fix, disable built-in and the observed result is as expected.

[b0o]

Excellent, thank you!