lint should ignore "node_modules" by default

[jamesponddotco]

Right now it's impossible to lint some projects locally because lint will always fail if the project includes a node_modules directory, which the user can't and shouldn't edit.

Since a --ignore flag can't be added as it defeats the purpose of the tool, I believe some common directories and files should be ignored by default, such as the nodule_modules directory or the .DS_Store file on macOS.

[aschrijver]

I thought that .gitignore was supposed to be honored, and just found that it is not for node_modules/ and even the old **/node_modules. In my monorepo top-level node_modules is ignored, but on a deeper package I get error:

The following files have no copyright and licensing information:
* packages/components/node_modules/.bin/astro