Remove build instructions from README

The build instructions in the README are incomplete, and are
redundant anyway because there is a dedicated build document.

Replace the instructions with a link to the build document.

Change-Id: I2c08341f036bfcf5f6e5d4b1973fcf046d5810ba

README.md

diff --git a/README.md b/README.md
index 9fbdd1a..b3b6665 100644
--- a/README.md
+++ b/README.md
@@ -18,25 +18,14 @@
 * `java-1.8`
 * `Bazel`
 
-Build
----------------------
-
-Clone or link this plugin to the plugins directory of Gerrit's source
-tree, and issue the command:
-
-
-    bazel build plugins/rabbitmq
-
-The output is created in
-
-    bazel-genfiles/plugins/rabbitmq/rabbitmq.jar
-
 Reference
 ---------------------
 
+* [Build]
 * [Configuration]
 * [Message Format]
 
+[Build]: src/main/resources/Documentation/build.md
 [Configuration]: src/main/resources/Documentation/config.md
 [Message Format]: src/main/resources/Documentation/message.md