sdk doc change for esr: Add "resources" tab content. Fix links pointing to the old locations. Change Android.mk to output samples files to resources/samples. Misc other fixes.

Bug: 2160782
Change-Id: Ib1eb2e9e3fe3a7b2ad16387dbf888646a1195221
diff --git a/docs/html/guide/index.jd b/docs/html/guide/index.jd
index ecbf97b..1674bc8 100644
--- a/docs/html/guide/index.jd
+++ b/docs/html/guide/index.jd
@@ -77,7 +77,7 @@
 <p>
 For additional help, consider joining one or more of the Android 
 discussion groups.  Go to the 
-<a href="{@docRoot}community/index.html">Community</a> tab above 
+<a href="{@docRoot}resources/community-groups.html">Community</a> pages 
 for more information.
 </p>