Remove trailing slash on void HTML elements (#2009)

According to the W3C's HTML validator, trailing slashes in void-element have no effect,
and might interact badly in some cases.

Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>

layouts/shortcodes/changelog/changelogs.html

@@ -4,5 +4,5 @@
 */}}
 
 {{ with index .Page.RegularPages.ByDate.Reverse 0 }}
-   <meta http-equiv="refresh" content="0; url={{ .RelPermalink }}" />
+   <meta http-equiv="refresh" content="0; url={{ .RelPermalink }}">
 {{ end }}

layouts/shortcodes/definition.html

@@ -39,7 +39,7 @@
 
 </summary>
 
-<hr/>
+<hr>
 
 {{ if (index $definition "x-addedInMatrixVersion") }}
   {{ partial "added-in" (dict "v" (index $definition "x-addedInMatrixVersion")) }}

layouts/shortcodes/diagram.html

@@ -45,8 +45,8 @@
     {{- $fallback := $highRes.Resize (printf "%sx png" $width) -}}
 
 <picture>
-    <source srcset="{{ $lowRes.RelPermalink }}, {{ $highRes.RelPermalink }} 2x" type="image/webp" />
-    <img src="{{ $fallback.RelPermalink }}" alt="{{ $alt }}" width="{{ $width }}" height="{{ $height }}" loading="lazy" />
+    <source srcset="{{ $lowRes.RelPermalink }}, {{ $highRes.RelPermalink }} 2x" type="image/webp">
+    <img src="{{ $fallback.RelPermalink }}" alt="{{ $alt }}" width="{{ $width }}" height="{{ $height }}" loading="lazy">
 </picture>
 {{- else -}}
     {{- errorf "diagram %s not found" $path -}}

layouts/shortcodes/event-fields.html

@@ -28,7 +28,7 @@
 </h1>
 </summary>
 
-<hr/>
+<hr>
 
 {{ $event.description | markdownify }}