intellij: remove custom tooling

- The patch hasn't applied in a long time, and nobody has complained,
  so it would appear that the patch is no longer necessary.

- localconfig and run configs are unused/unmaintained.

Change-Id: I6a6a6964d58dac6b7f2e749059716edf98ac129f
Reviewed-on: https://review.monogon.dev/c/monogon/+/4404
Reviewed-by: Tim Windelschmidt <tim@monogon.tech>
Tested-by: Jenkins CI
diff --git a/SETUP.md b/SETUP.md
index 908ed0e..9d0113f 100644
--- a/SETUP.md
+++ b/SETUP.md
@@ -104,7 +104,8 @@
 
 - Install the [Bazel](https://plugins.jetbrains.com/plugin/8609-bazel),
   Go and Protocol Buffer plugins in IntelliJ.
-- Make sure that Bazel "*Bazel Binary Location*" in Other Settings → Bazel Settings points to Bazelisk.
+- Make sure that Bazel "*Bazel Binary Location*" in Other Settings → Bazel Settings points to Bazelisk
+  (or tools/bazel, if you're on NixOS).
 - Use _File → Import Bazel project_... and select your monorepo checkout.
 
 After running the first sync (Alt-Y), everything should now resolve in the IDE, including generated code.