update website for addons release, docs.
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Key: UIMA-2218
URL: https://issues.apache.org/jira/browse/UIMA-2218
Project: UIMA
Issue Type: Task
Reporter: Marshall Schor
Assignee: Marshall Schor
After promoting "sandbox" docs corresponding to 2.3.1 addons release, update
the website for these. Also, update the website for addons, vs. sandbox.
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