Use mutable variables instead of scratch where possible

Signed-off-by: Danila Fedorin <danila.fedorin@gmail.com>

layouts/_default/_markup/render-link.html

@@ -1,24 +1,25 @@
-{{- $scratch := newScratch -}}
+{{- $class := "" -}}
+{{- $icon := "" -}}
 {{- $absoluteDest := absLangURL .Destination -}}
 {{- $siteRootUrl := absLangURL "" -}}
 {{- $isExternal := not (hasPrefix $absoluteDest $siteRootUrl) -}}
 {{- $isSamePage := hasPrefix .Destination "#" -}}
 
 {{- if $isSamePage -}}
-  {{- $scratch.Set "class" "same-page-link" -}}
+  {{- $class = "same-page-link" -}}
   {{- if index (.Page.Scratch.Get "definedSections") .Destination -}}
-    {{- $scratch.Set "icon" "arrow-up" -}}
+    {{- $icon = "arrow-up" -}}
   {{- else -}}
     {{- /* Do not render "down" links because don't know how to distinguish unseen titles from paragraph links. */ -}}
-    {{- /* $scratch.Set "icon" "arrow-down" */ -}}
+    {{- /* $icon = "arrow-down" */ -}}
   {{- end -}}
 {{- else if $isExternal -}}
-  {{- $scratch.Set "class" "external-link" -}}
-  {{- $scratch.Set "icon" "external-link" -}}
+  {{- $class = "external-link" -}}
+  {{- $icon = "external-link" -}}
 {{- end -}}
 <a href="{{ .Destination | safeURL }}"
   {{- with .Title }} title="{{ . }}"{{ end -}}
-  {{- with $scratch.Get "class" -}}
+  {{- with $class -}}
     class="{{ . }}"
   {{- end -}}
   {{- if (and site.Params.externalLinksInNewTab $isExternal) -}}
@@ -26,6 +27,6 @@
   {{- end -}}
 >
   {{- with .Text | safeHTML }}{{ . }}{{ end -}}
-  {{- with $scratch.Get "icon" -}}{{- partial "icon.html" . -}}{{- end -}}
+  {{- with $icon -}}{{- partial "icon.html" . -}}{{- end -}}
 </a>
 {{- /* chomp trailing newline */ -}}