Remove deprecated usage of ".Page.URL" in theme

The current theme uses ".URL" in a number of places that is resulting in
the current warning message:

    Page.URL is deprecated and will be removed in a future release. Use .Permalink or .RelPermalink. If what you want is the front matter URL value, use .Params.url

Update the usage of this variable to ".Permalink" to stop the warning
messages being produced.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>

themes/beautifulhugo/layouts/_default/list.html

@@ -63,12 +63,12 @@
           <ul class="pager main-pager">
             {{ if .Paginator.HasPrev }}
               <li class="previous">
-                <a href="{{ .URL }}page/{{ .Paginator.Prev.PageNumber }}">&larr; {{ i18n "newerPosts" }}</a>
+                <a href="{{ .Permalink }}page/{{ .Paginator.Prev.PageNumber }}">&larr; {{ i18n "newerPosts" }}</a>
               </li>
             {{ end }}
             {{ if .Paginator.HasNext }}
               <li class="next">
-                <a href="{{ .URL }}page/{{ .Paginator.Next.PageNumber }}">{{ i18n "olderPosts" }} &rarr;</a>
+                <a href="{{ .Permalink }}page/{{ .Paginator.Next.PageNumber }}">{{ i18n "olderPosts" }} &rarr;</a>
               </li>
             {{ end }}
           </ul>

themes/beautifulhugo/layouts/index.html

@@ -46,12 +46,12 @@
           <ul class="pager main-pager">
             {{ if .Paginator.HasPrev }}
               <li class="previous">
-                <a href="{{ .URL }}page/{{ .Paginator.Prev.PageNumber }}">&larr; {{ i18n "newerPosts" }}</a>
+                <a href="{{ .Permalink }}page/{{ .Paginator.Prev.PageNumber }}">&larr; {{ i18n "newerPosts" }}</a>
               </li>
             {{ end }}
             {{ if .Paginator.HasNext }}
               <li class="next">
-                <a href="{{ .URL }}page/{{ .Paginator.Next.PageNumber }}">{{ i18n "olderPosts" }} &rarr;</a>
+                <a href="{{ .Permalink }}page/{{ .Paginator.Next.PageNumber }}">{{ i18n "olderPosts" }} &rarr;</a>
               </li>
             {{ end }}
           </ul>

themes/beautifulhugo/layouts/partials/head.html

@@ -30,13 +30,13 @@
 {{- with .Site.Params.fb_app_id }}
   <meta property="fb:app_id" content="{{ . }}" />
 {{- end }}
-  <meta property="og:url" content="{{ .URL | absLangURL }}" />
+  <meta property="og:url" content="{{ .Permalink | absLangURL }}" />
   <meta property="og:type" content="website" />
   <meta property="og:site_name" content="{{ .Site.Title }}" />
 <!-- Hugo Version number -->
   {{ hugo.Generator -}}
 <!-- Links and stylesheets -->
-  <link rel="canonical" href="{{ .URL | absLangURL }}" />
+  <link rel="canonical" href="{{ .Permalink | absLangURL }}" />
   <link rel="alternate" href="{{ "index.xml" | absLangURL }}" type="application/rss+xml" title="{{ .Site.Title }}">
   <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.7.1/katex.min.css" integrity="sha384-wITovz90syo1dJWVh32uuETPVEtGigN07tkttEqPv+uR2SE/mbQcG7ATL28aI9H0" crossorigin="anonymous">
   <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.0.13/css/all.css" integrity="sha384-DNOHZ68U8hZfKXOrtjWvjxusGo9WQnrNx2sqG0tfsghAvtVlRW3tvkXWZh58N9jp" crossorigin="anonymous">

themes/beautifulhugo/layouts/partials/nav.html

@@ -80,13 +80,13 @@
         {{ $section := .FirstSection }}
         {{ range sort .Site.Sections.ByTitle }}
           <li class="sidebar-section">
-            <a href="{{ .URL | relLangURL }}"
+            <a href="{{ .Permalink | relLangURL }}"
                {{ if eq .FirstSection $section }}id="sidebar-focus" class="sidebar-focus"{{end}}>{{ .Title }}</a>
             <div class="sidebar-pages">
               <ul>
                 {{ range .Pages.ByTitle }}
                   <li class="sidebar-page">
-                    <a href="{{ .URL | relLangURL }}">{{ .Name }}</a>
+                    <a href="{{ .Permalink | relLangURL }}">{{ .Name }}</a>
                   </li>
                 {{ end }}
               </ul>