Update project template to handle sidebar links for non-pages. (#4)

Signed-off-by: Artem Kladov <artem.kladov@flant.com>

Author: z9r5

layouts/_partials/sidebar.html

@@ -28,7 +28,7 @@
     {{- range $parent.Pages.ByWeight }}
     {{- if not .Params.hidden }}
     <li class="sidebar__submenu-item {{ if or (eq . $currentPage) (.IsAncestor $currentPage) }}active{{ end }}{{ if .Pages }} sidebar__submenu-item_parent has-children{{ end }}">
-        <a href="{{ .RelPermalink }}">
+        <a href="{{ if .IsPage }}{{ .RelPermalink }}{{ else }}#{{end}}">
           <span class="sidebar__submenu-title" {{ if eq $level 1 }}style="font-size: 16px;"{{ end }}>
             {{- if .Title }}
                 {{- .Title }}