Identify canonical and alternate URLs (#1026)

Co-authored-by: ann0see <[email protected]>

_includes/headtags.html

@@ -1,14 +1,15 @@
 <meta charset="utf-8">
 <!-- Canonical and Alternate Links -->
-{% assign sorted_languages = site.languages | sort %}
-{% for lng in sorted_languages %}
-  {% if lng == site.default_lang %}
-    <link rel="canonical" href="{{ site.url }}{{ site.baseurl }}{{ page.url }}">
-  {% else %}
+{% comment %}
+English URLs don't have a lang subdirectory since it's the default language.
+See https://github.com/untra/polyglot
+{% endcomment %}
+    <link rel="canonical" hreflang="en" href="{{ site.url }}{{ site.baseurl }}{{ page.url }}">
+{% for lng in site.languages | sort %}
+  {% if lng != "en" %}
     <link rel="alternate" hreflang="{{ lng }}" href="{{ site.url }}{{ site.baseurl }}/{{ lng }}{{ page.url }}">
   {% endif %}
 {% endfor %}
-<link rel="alternate" hreflang="x-default" href="{{ site.url }}/{{ page.url }}">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <link rel="stylesheet" href="/assets/css/fox.min.css">
 <link rel="stylesheet" href="/assets/css/fw.css">

wiki/en/misc/1-index.md

@@ -28,7 +28,7 @@ Jamulus lets you play, rehearse, or jam with your friends, your band, or anyone
 <div class="fx-row fx-row-center-xs" id="bannercontainer">
   <div class="fx-col-100-xs">
     <figure class="mainbannerfig">
-      <a href="wiki/Getting-Started" rel="canonical">
+      <a href="wiki/Getting-Started">
       <img src="{% include img/en-screenshots/main-screen-medium.inc %}" style="border: 5px solid grey;" id="jamulusbanner" loading="lazy" alt="A screenshot of the main mixer window showing five people from different countries connected.">
       </a>
       <figcaption>Jamulus is international</figcaption>