add redirects for some orphaned docs.

coincides with the doc removals in I6539076edf8962fd974d790a0edd1d4badc4d5f7

Change-Id: I1cac3419835fe8402d416c14eb11652c89b0dd81

Author: scottamain

scripts/app_engine_server/redirects.yaml

@@ -253,7 +253,7 @@ redirects:
   comment: Redirect to new location
 
 # new one
-- src: /guide/basics/what-is-android.html
+- src: /guide/basics/.*
   dst: /about/index.html
   type: permanent
   comment: Redirect to new location
@@ -263,6 +263,11 @@ redirects:
   type: permanent
   comment: Redirect to new location
 
+- src: /guide/topics/security/index.html
+  dst: /training/articles/security-tips.html
+  type: permanent
+  comment: Redirect to new location
+
 # new one
 - src: /guide/appendix/market-filters.html
   dst: /google/play/filters.html