Allow single pages (#35)

* Let users create single sites

* Create shortcodes for bulma (sub)titles

* Support sidebar in singlepages only

* Fix shortcodes according to the bulma doc

* Use h5 tag for is-5 class

layouts/partials/navbar-clone.html

@@ -1,5 +1,8 @@
 {{- $navbar         := .Site.Params.navbar }}
 {{- $sidebarVisible := .Site.Params.sidebar }}
+{{ if .Params.sidebar }}
+{{ $sidebarVisible = .Params.sidebar }}
+{{ end }}
 {{- $navbarLogo     := .Site.Params.navbarlogo }}
 <nav id="navbar-clone" class="navbar is-fresh is-transparent" role="navigation" aria-label="main navigation">
   <div class="container">