index.html: better introduction in the first paragraph

Until now, the first paragraph of the top page wasn't clear about
exactly what Maneage is (for someone who is new to the term "data
lineage"). Also, there was no mention of Maneage's license.

With this commit, the previous first paragraph has been broken into
two. The first paragraph is almost fully new and gives a basic
introduction for someone who isn't familiar with the terms "data
lineage" or "data provenance". The second paragraph stars with the
license of Maneage and then goes into the links with the papers and
vidoes and etc.

Both these issues were raised by Richard Stallman.

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