Upgrade Hugo to 0.52 (#11552)

* Update Hugo version and apply HTML minification to production builds

* Use full flag names for clarity

* Remove Hugo installation logic out of Travis config and into Makefile

* Add Hugo version checking script

* Fix Netlify config version

scripts/hugo-version-check.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+MAIN_HUGO_VERSION=$1
+NETLIFY_HUGO_VERSION=$(cat netlify.toml | grep HUGO_VERSION | awk '{ print $3 }' | tr -d '"')
+
+echo ${NETLIFY_HUGO_VERSION}
+
+if [[ ${MAIN_HUGO_VERSION} != ${NETLIFY_HUGO_VERSION} ]]; then
+    echo """
+    [FAILURE] The Hugo version set in the Makefile is ${MAIN_HUGO_VERSION} while the version in netlify.toml is ${NETLIFY_HUGO_VERSION}
+    [FAILURE] Please update these versions so that they are same (consider the higher of the two versions as canonical).
+    """
+    exit 1
+else
+    echo "[SUCCESS] The Hugo versions match between the Makefile and netlify.toml"
+    exit 0
+fi
+