Documentation: Add missing footer that links to plugin index page

Change-Id: I1a654a09ab6d760d31dc370bc7c6ca69bf2a8384
diff --git a/src/main/resources/Documentation/build.md b/src/main/resources/Documentation/build.md
index 68a99eb..33f9bd0 100644
--- a/src/main/resources/Documentation/build.md
+++ b/src/main/resources/Documentation/build.md
@@ -82,3 +82,7 @@
 ```
   ./tools/eclipse/project.py
 ```
+
+[Back to @PLUGIN@ documentation index][index]
+
+[index]: index.html