Remove Copyright from CC License in Footer

[joewheaton]

• [x] Link "Riverscapes Consortium" to http://creativecommons.org/licenses/by/4.0/
• [x] Remove "Copyright"
• [ ] Later, all our sites will do something like this in the footer: i.e. provide citation via tying repo to Zenodo DOI, and stating the license terms.

[MattReimer]

Work done. Changes should appear once we get things publishing