made some style fixes
Revert "made some style fixes" - since I added a whole unless folder `.c9/`

This reverts commit fb0ddf0bbf548441a2f1c270c241c7620d1d2c42.
added truncation for excerpt
uppercase for main navigation
same font style for post author and post date
footer removed first column
pagination: aligned to background
excluded '.c9' folder to avoid constant generating by c9.io jekyll
added archive page and navigation entry
added archive page :-)