Feature request: Support for an ignore file

I would love to see a built-in support for an ignore file to use within the folders opened in Lettera; something ideally based on .gitignore rules.

Such ignore file would be very useful, if I’m opening a project folder including non-MD files, or large folders Lettera shouldn’t even try to index ever (i.e. node_modules, vendor).

For example; .lettera-ignore