Add documentation how to disable rule in config

[vfonic]

Hi, thanks for great linter!

I just tried it out and love it!

Unfortunately, I also spent 10min trying to figure out how to disable the rule through config file. I tried things like:

• Reading the documentation
• "enalbed": false
• "disabled": true

...and then finally found it in one of the issues.

I think this should be added in the documentation, as "level": "ignore" is not the most intuitive.

Thanks!