netlify: Bump to Hugo 0.91.1

Also remove the usage of getenv in the example site.

exampleSite/layouts/partials/hook_head_end.html

@@ -1,12 +0,0 @@
-{{ with getenv "ADD_GA" }}
-<script>
-  (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
-  (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
-  m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
-  })(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
-
-  ga('create', 'UA-52478213-11', 'auto');
-  ga('send', 'pageview');
-
-</script>
-{{ end }}

exampleSite/layouts/partials/hook_left_sidebar_end.html

@@ -1,7 +0,0 @@
-{{ if getenv "REPOSITORY_URL" -}}
-<div style="margin-left: 20px; margin-top: 20px">
-<a href="https://www.netlify.com">
-  <img src="https://www.netlify.com/img/global/badges/netlify-dark.svg"/>
-</a>
-</div>
-{{ end }}

netlify.toml

@@ -3,18 +3,18 @@ publish = "exampleSite/public"
 command = "hugo --gc -s exampleSite --minify"
 
 [context.production.environment]
-HUGO_VERSION = "0.88.1"
+HUGO_VERSION = "0.91.1"
 
 [context.deploy-preview]
 command = "hugo -s exampleSite --minify -D -F -b $DEPLOY_PRIME_URL"
 
 [context.deploy-preview.environment]
-HUGO_VERSION = "0.88.1"
+HUGO_VERSION = "0.91.1"
 
 [context.branch-deploy]
 command = "hugo -s exampleSite --minify --gc -b $DEPLOY_PRIME_URL"
 
 [context.branch-deploy.environment]
-HUGO_VERSION = "0.88.1"
+HUGO_VERSION = "0.91.1"