Issue 2264: update readme

https://code.google.com/p/otwarchive/issues/detail?id=2264

This is a documentation change, but since it's a very visible documentation change, please give feedback if anything seems missing or incorrect or too much information. :) The link to the footer is also updated to point to the same license (GPL v2).
Definitely yes on making it gender neutral. If we want to avoid "their" for some reason, we can always go "any fan archivist interested in creating and maintaining a fanwork archive" or such.