changed default active update interval from 5 to 15
set doge mode disabled by default + minor changes to doge mode
 - made some minor changes allow doge mode to run on (almost) any webpage
  - background image link changed from relative to absolute
  - switched doge divs from absolute to fixed so they no longer scroll with the page
minor cleanup everywhere
 - added character encoding (UTF-8)
 - fixed some incorrect/illegal html tags
 - moved rest of JS event handlers from HTML to JS