Initial version of the web page

  * Work in progress: setting up the site
  * Uses Jekyll (pages should be in Markdown)
  * Contains the chosen initial layout: variant-multi-full from
    AndreasViklund.com
  * Still needs a lot of editing
  * Add a page and post layout.  To change the current page layout we should
    edit _layouts/page.html. To change the current posts layout we should edit
    _layouts/post.html
  * Add a download section
  * Update main page
  * Add first test post