Introduce OSCAR in homepage

[essepuntato]

Change

The whole OCC is now available for querying (via SPARQL) and for browsing by means of a very simple Web interface that shows only the data about bibliographic entities (e.g. https://w3id.org/oc/corpus/br/1). Additional and more user-friendly interfaces will be available in the coming months, and will be described in this page.

to

The entire content of the OCC is now available for querying via our OSCAR, our textual search interface, and a new Browse interface is coming soon.  Programmatic access is obtainable via a SPARQL endpoint for directly querying the Blazegraph triplestore in which we store our RDF data, and we plan to supplement programmatic access in the near future by provision of a REST API.  In addition, the contents of the entire triplestore, and of the various sub-components of the Corpus, together with their provenance information, can be downloaded from monthly dumps stored on Figshare.  Future developments will include graphical user interfaces for interactive visualization of citation graphs.