v1.0.2

• Add a Dockerfile to the template. New projects include a Dockerfile.
• Add an helper function, absurl, for Jinja2 to generate absolute URLs to the
  application itself, handling the application Router.prefix.
• Use absolute URLs in links in jinja templates to render proper links in
  sub-pages, like /home/example/.
• Upgrade to BlackSheep 2.1.0.
• Modify the project template to support the new Router prefix feature, and
  the APP_ROUTE_PREFIX env variable to control the route prefix globally.
• Use the get_diagnostic_app from BlackSheep, as it is now included in the
  library.
• Use the get_trailing_slash_middleware function, to ensure all HTML
  documents are served at a path ending with a trailing '/'. This is necessary
  to ensure relative links in HTML documents work consistently.
• Add possibility to change the background color of the top section using an
  env variable BG_COLOR. This is to better support testing multiple
  installation using path based routing.