gitignore: Be explicit when we have a specific path in mind.
gitignore: Be explicit when we have a specific path in mind.

For example, the `coverage/` subdirectory at the root is where our
Jest coverage output goes; but if we wrote some code that had
something to do with coverage of some kind, we might put it under a
directory like `src/coverage/`, and it'd be surprising to have that
directory just vanish as far as Git is concerned.

vishwesh3/zulip-mobile,vishwesh3/zulip-mobile,vishwesh3/zulip-mobile,vishwesh3/zulip-mobile