feat: disable preview for large files

[stevalkr]

• feature request: options disable preview for large files #213

Hi, I’ve made a small change to prevent nvim session from freezing when previewing large files.

[stevearc]

Change looks good, but I've had to refactor a bunch of the config names recently to reduce confusion. You'll need to rebase to resolve the merge conflicts.

[stevearc]

typechecking errors. If you have LuaLS installed you can run make lint to view to run it locally

[stevalkr]

Sorry about that, I didn’t check all the changes thoroughly. Should be all good now.

[stevearc]

Thanks for the PR!