Guides changed to CC-BY-SA license.

The Security Guide has been regenerated and posted on docs.fp.o in English and Spanish. The Dutch version is having problems being built, however, so this version hasn't been pushed. Also, the Security Guide package has been updated as well. I believe Rudi said that all other guides have been rebuilt and pushed to docs.fp.o. Can everyone verify that their package has been updated, please? Please post to the list what you find. Thanks. --Eric