YAML Front Matter Schema Validation via. YAML LSP

[codytwinton]

Is your feature request related to a problem? Please describe.
When working with YAML configs, schema validation is always a really great feature to have.

Describe the solution you'd like
Red Hat has developed a language server for YAML and it supports schemas. It would be amazing to tap into the .forestry/ for schemas that could be validated.

Describe alternatives you've considered
Some form of additional schema validation could certainly resolve this issue.