moving the echo command before it gets hairy

cmd/echo/BUILD.bazel

@@ -1,14 +1,14 @@
 load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library")
 
 go_library(
-    name = "cmd_lib",
+    name = "echo_lib",
-    srcs = ["echo.go"],
+    srcs = ["server.go"],
-    importpath = "code.ndumas.com/ndumas/gomud/cmd",
+    importpath = "code.ndumas.com/ndumas/gomud/cmd/echo",
     visibility = ["//visibility:private"],
 )
 
 go_binary(
-    name = "cmd",
+    name = "echo",
-    embed = [":cmd_lib"],
+    embed = [":echo_lib"],
     visibility = ["//visibility:public"],
 )