docs: add gingerbread logo for homepage

Change-Id: I54db7009931e1ec5688d4f473a520a4f61db598a
diff --git a/tools/droiddoc/templates/assets/images/home/gingerdroid.png b/tools/droiddoc/templates/assets/images/home/gingerdroid.png
new file mode 100644
index 0000000..8399d84
--- /dev/null
+++ b/tools/droiddoc/templates/assets/images/home/gingerdroid.png
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