Lightweight packaging document merged

The Lightweight package document has been merged and is now properly readable via:

https://w3c.github.io/pwpub/spec/ocf-lite.html <https://w3c.github.io/pwpub/spec/ocf-lite.html>

Ivan

P.S. Laurent, I had to make some changes on the document to get respec working. 

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Ivan Herman, W3C 
Publishing@W3C Technical Lead
Home: http://www.w3.org/People/Ivan/
mobile: +31-641044153
ORCID ID: https://orcid.org/0000-0003-0782-2704