Sends template tweaks to master...

* adds block for about the data page to base.html
* adds about the data template
* adds about page view to views.py
* updates urls and views for the about the data page
* removes un-needed items from the about view
* changes url scheme to about/<x>
* renames about template to match mission of the page
* renames about template to match mission of the page
* adds the html to the about the data page
* changes the name of the about data page in views.py
* renames content block for about_data content
* adds revised markup to the archives page