Fix OneTrust Styling

- Remove the Floating Cookie Settings dialog in favor of the
  Cookie Settings Link
- Update Cookie Settings link to be cursor: pointer to indicate
  it can be clicked

Closes gh-284

Author: rwinch

src/css/vendor/onetrust.css

@@ -0,0 +1,7 @@
+#ot-sdk-btn-floating {
+  display: none;
+}
+
+.ot-sdk-show-settings {
+  cursor: pointer;
+}

src/partials/head-styles.hbs

@@ -8,6 +8,7 @@
     <link rel="stylesheet" href="{{{uiRootPath}}}/css/site.css">
     <link rel="stylesheet" href="{{{uiRootPath}}}/css/vendor/search.css">
     <link rel="stylesheet" href="{{{uiRootPath}}}/css/vendor/page-search.css">
+    <link rel="stylesheet" href="{{{uiRootPath}}}/css/vendor/onetrust.css">
     <link rel="stylesheet" href="{{{uiRootPath}}}/css/vendor/{{#if (asciidocExtensionRegistered '@asciidoctor/tabs')}}asciidoctor{{else}}spring{{/if}}-tabs.css">
     {{#if env.SITE_ASCIINEMA_PROVIDER}}
     {{> asciinema-styles}}