Update Pygments style sheet

Generate new CSS style sheet for Pygments code syntax highlighting.
Fix navbar styling issue in reponsive design

Remove extraneous whitespace above navbar on smartphones. Also remove
trailing whitespace at bottom of document.
Add reStructuredText Viewer to list of projects

Update projects list adding the new reStructuredText Viewer project and
fixing typos in the descriptions for other projects.
Finished article on reStructuredText Viewer

Short article on building the reStructuredText Viewer application using
Flask and docutils.