We lost the war against top level configuration files many moons ago.
This is what developers and tools expect. And it seems to be required
for eslint-import-resolver-webpack (there’s ostensibly a {"config":
"tools/webpack.config.ts"} option, but it doesn’t work correctly:
https://github.com/benmosher/eslint-plugin-import/issues/1861).
Signed-off-by: Anders Kaseorg <anders@zulip.com>