Update to Hugo 0.53 and remove all .Site references (#12079)

* Remove all .Site variable references

* Update Hugo version in Travis CI config and Makefile

layouts/shortcodes/blocks/__common.html

@@ -1,7 +1,7 @@
 {{/* This file contains some common template definitions used in the blocks shortcodes. 
 The reasoning behind the long and hard-to-remember template names is that these templates are global. */}}
 {{ define "shortcodes-blocks_getimage" }}
-{{- $cr := .ctx.Site.GetPage "/_common-resources" -}}
+{{- $cr := site.GetPage "/_common-resources" -}}
 {{- with $cr -}}
 {{- $image := $cr.Resources.GetMatch (printf "images/**%s*" $.name ) -}}
 {{- with $image -}}
@@ -12,4 +12,4 @@ The reasoning behind the long and hard-to-remember template names is that these
 {{- else -}}
 {{ errorf "[%s] No resource bundle found. Create an empty headless bundle; create content/%s/_common-resources/index.md with \"headless: true\" in front matter. See https://gohugo.io/content-management/page-bundles/#headless-bundle"  $.ctx.Page.Lang $.ctx.Page.Lang }}
 {{- end -}}
-{{- end -}}
+{{- end -}}

layouts/shortcodes/blocks/case-studies.html

@@ -1,4 +1,4 @@
-{{ $caseStudiesSection := .Site.GetPage "case-studies" }}
+{{ $caseStudiesSection := site.GetPage "case-studies" }}
 {{ if not $caseStudiesSection }}
 {{ errorf "[%s] No case-studies section found. Create content/%s/case-studies/_index.md"  $.Page.Lang $.Page.Lang }}
 {{ else }}
@@ -19,4 +19,4 @@
     <h5 style="text-align: center"><a href="/case-studies/" style="color: #3371E3; font-weight: 400">{{ $caseStudiesSection.LinkTitle }}</a></h5>
   </main>
 </section>
-{{ end }}
+{{ end }}

layouts/shortcodes/blocks/kubernetes-features.html

@@ -17,7 +17,7 @@ Note that markdown can be used in the description.
 <section id="features">
     <main>
         <h3 class="center">{{ T "main_kubernetes_features" }}</h3>
-        {{ $pages := where .Site.Pages ".Params.feature" "!=" nil }}
+        {{ $pages := where site.Pages ".Params.feature" "!=" nil }}
         {{range $i, $p := $pages }}
         {{ if and (gt $i 0) (modBool $i 2) }}</div>{{ end }}
         {{ if modBool $i 2 }}
@@ -33,4 +33,4 @@ Note that markdown can be used in the description.
      
         {{ end }}
     </main>
-</section>
+</section>