Get rid of bazel.

Good riddance. More of a headache than it's worth.

testutil/BUILD.bazel

@@ -1,8 +0,0 @@
-load("@io_bazel_rules_go//go:def.bzl", "go_library")
-
-go_library(
-    name = "testutil",
-    srcs = ["testutil.go"],
-    importpath = "git.wntrmute.dev/kyle/goutils/testutil",
-    visibility = ["//visibility:public"],
-)