initial configuration

* site configuration
* changed date format
* added content div
* removed buttons from navbar-toggle
* added additional row of buttons at sidebar
* corrected sidebar hiding
* added alt-text to logo images
* added about page
* added navigation items for about and archive pages
* changed footer to add licensing, disclaimer, validation, source, and
credit lines
* corrected commended begin/end of sidebar.html
* removed core-samples
* add dummy ‘welcome’ post
* changed monospace font in sidebar to sans-serif
* changed special font in footer to sans-serif
* changed style of all images in content block to make more responsive