Update for new Hugo versions

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

layouts/_markup/render-blockquote.html

@@ -0,0 +1,9 @@
+{{ if and (eq .Type "alert") (eq .AlertType "todo") -}}
+<div style="background-color: tomato; color: white; padding: 10px;">
+    <em>TODO: </em>{{- .Text | plainify -}}
+</div>
+{{- else -}}
+<blockquote {{- with .Attributes.id }} id="{{ . }}"{{ end }}>
+{{ .Text -}}
+</blockquote>
+{{- end }}

layouts/_markup/render-heading.html

@@ -0,0 +1,6 @@
+{{- .Page.Scratch.SetInMap "definedSections" (printf "#%s" .Anchor) true -}}
+<a href="#{{ .Anchor }}">
+  <h{{ .Level }} id="{{ .Anchor }}">
+    {{- .Text | safeHTML -}}
+  </h{{ .Level }}>
+</a>

layouts/_markup/render-link.html

@@ -0,0 +1,32 @@
+{{- $class := "" -}}
+{{- $icon := "" -}}
+{{- $absoluteDest := absLangURL .Destination -}}
+{{- $siteRootUrl := absLangURL "" -}}
+{{- $isExternal := not (hasPrefix $absoluteDest $siteRootUrl) -}}
+{{- $isSamePage := hasPrefix .Destination "#" -}}
+
+{{- if $isSamePage -}}
+  {{- $class = "same-page-link" -}}
+  {{- if index (.Page.Scratch.Get "definedSections") .Destination -}}
+    {{- $icon = "arrow-up" -}}
+  {{- else -}}
+    {{- /* Do not render "down" links because don't know how to distinguish unseen titles from paragraph links. */ -}}
+    {{- /* $icon = "arrow-down" */ -}}
+  {{- end -}}
+{{- else if $isExternal -}}
+  {{- $class = "external-link" -}}
+  {{- $icon = "external-link" -}}
+{{- end -}}
+<a href="{{ .Destination | safeURL }}"
+  {{- with .Title }} title="{{ . }}"{{ end -}}
+  {{- with $class -}}
+    class="{{ . }}"
+  {{- end -}}
+  {{- if (and site.Params.externalLinksInNewTab $isExternal) -}}
+    target="_blank" rel="noopener noreferrer"
+  {{- end -}}
+>
+  {{- with .Text | safeHTML }}{{ . }}{{ end -}}
+  {{- with $icon -}}{{- partial "icon.html" . -}}{{- end -}}
+</a>
+{{- /* chomp trailing newline */ -}}