Add SEO metadata partial and bump Hugo version to 0.53 (#508)

Signed-off-by: lucperkins <lucperkins@gmail.com>

website/layouts/shortcodes/providers.html

@@ -1,11 +1,11 @@
-{{- $providers := .Site.Data.providers }}
+{{ $providers := site.Data.providers }}
 <ul>
-  {{- range $providers }}
-  {{- $url := printf "https://github.com/virtual-kubelet/virtual-kubelet/tree/master/providers/%s" .tag }}
+  {{ range $providers }}
+  {{ $url := printf "https://github.com/virtual-kubelet/virtual-kubelet/tree/master/providers/%s" .tag }}
   <li>
     <a href="{{ $url }}">
       {{ .name | markdownify }}
     </a>
   </li>
-  {{- end }}
+  {{ end }}
 </ul>

website/layouts/shortcodes/svg.html

@@ -1,6 +1,6 @@
-{{- $src      := .Get "src" }}
-{{- $path     := printf "static/%s" $src | relURL }}
-{{- $figureId := $.Page.Scratch.Get "numFigures" }}
+{{ $src      := .Get "src" }}
+{{ $path     := printf "static/%s" $src | relURL }}
+{{ $figureId := $.Page.Scratch.Get "numFigures" }}
 <figure id="figure-{{ $figureId }}">
   {{ $path | readFile | safeHTML }}
   <figcaption>