issue2551029: Jinja2 template install error. Issue where template's config.ini not getting updated. Change do_install in admin.py to load config_ini.ini from template before writing tracker's config.ini. This generates an updated config file for the user on install preserving values required tomake tracker work. Added config_ini.ini files to jinja2 and responsive templates to set required values (template_engine and static_files; static_files resp.). Documented new file in doc/tracker_templates.txt and added tests for new admin.py code.

//
// Hero unit
// --------------------------------------------------


.hero-unit {
  padding: 60px;
  margin-bottom: 30px;
  font-size: 18px;
  font-weight: 200;
  line-height: @baseLineHeight * 1.5;
  color: @heroUnitLeadColor;
  background-color: @heroUnitBackground;
  .border-radius(6px);
  h1 {
    margin-bottom: 0;
    font-size: 60px;
    line-height: 1;
    color: @heroUnitHeadingColor;
    letter-spacing: -1px;
  }
  li {
    line-height: @baseLineHeight * 1.5; // Reset since we specify in type.less
  }
}