fix(a11y): zen mode not working when showZenMode is false

load zen-mode.js in head.html for clarity

layouts/partials/meta/zen-mode.html

@@ -1,12 +1,3 @@
-{{ $jsZenMode := resources.Get "js/zen-mode.js" }}
-{{ $jsZenMode = $jsZenMode | resources.Minify | resources.Fingerprint (.Site.Params.fingerprintAlgorithm | default "sha512") }}
-
-
-<script
-  type="text/javascript"
-  src="{{ $jsZenMode.RelPermalink }}"
-  integrity="{{ $jsZenMode.Data.Integrity }}"></script>
-
 <span class="mb-[2px]">
   <span
     id="zen-mode-button"