Deprecate the old reference implementations, once this is released

[jadelkhoury]

We should update the pages of the old implementations to reference this new one.

The old reference implementations are under https://github.com/eclipse/lyo.rio
https://github.com/eclipse/lyo.rio/tree/master/rio is one
https://github.com/eclipse/lyo.rio/tree/master/rio-oslc4j is two
https://github.com/eclipse/lyo.rio/tree/master/rio-oslc3/org.eclipse.lyo.oslc.v3.sample is not a full RIO but just a sample of OSLC3/LDP implementation.

[berezovskyi]

We should actually ask Eclipse to archive the RIO repo.