Documentation: Add missing footer that links to plugin index page

Change-Id: I53a9187bb5ab76db6f3e4b4a855f9563c1728020
diff --git a/src/main/resources/Documentation/build.md b/src/main/resources/Documentation/build.md
index e389fec..6386725 100644
--- a/src/main/resources/Documentation/build.md
+++ b/src/main/resources/Documentation/build.md
@@ -79,3 +79,7 @@
 ```
   ./tools/eclipse/project.py
 ```
+
+[Back to @PLUGIN@ documentation index][index]
+
+[index]: index.html