Remove left over .buckconfig from buck build

Buck build was removed in Ifdb48360e, but .buckconfig was missed.

Change-Id: I166c7f12e34cc0f5c1b854cd36f3c4207766435d

.buckconfig

diff --git a/.buckconfig b/.buckconfig
deleted file mode 100644
index 36cf847..0000000
--- a/.buckconfig
+++ /dev/null
@@ -1,17 +0,0 @@
-[alias]
-  all = //:all
-  blame-cache = //blame-cache:lib
-  in = //:install
-  mvn_install = //:install
-  mvn_deploy = //:deploy
-
-[buildfile]
-  includes = //bucklets.defs
-
-[java]
-  src_roots = java, resources
-  source_level = 8
-  target_level = 8
-
-[project]
-  ignore = .git