add banner for Grace Hopper Celebration Open Source Day (#4759)

Author: Trott

layouts/index.hbs

@@ -19,9 +19,13 @@
         {{/if}}
 
         {{#if ( betweenDate site.banners.index.startDate site.banners.index.endDate ) }}
+          {{#if site.banners.index.text}}
           <p class="home-version home-version-banner">
             <a href="{{ site.banners.index.link }}">{{ site.banners.index.text }}</a>
           </p>
+          {{ else }}
+            <a href="{{ site.banners.index.link }}">{{{ site.banners.index.html }}}</a>
+          {{/if}}
         {{/if}}
 
         <h2 id="home-downloadhead" data-dl-local="{{ labels.download-for }}">{{ labels.download }}</h2>

locale/en/site.json

@@ -159,10 +159,11 @@
   },
   "banners": {
     "index": {
-      "startDate": "2022-06-27T16:00:00.000Z",
-      "endDate": "2022-07-13T16:00:00.000Z",
-      "text": "New security releases now available for Node.js 14, 16, and 18 release lines",
-      "link": "https://nodejs.org/en/blog/vulnerability/july-2022-security-releases/"
+      "startDate": "2022-07-29T16:00:00.000Z",
+      "endDate": "2022-08-11T16:00:00.000Z",
+      "text": null,
+      "html": "<img alt='Grace Hopper Celebration' src='/static/images/ghc-banner.png' />",
+      "link": "https://anitab-org.github.io/open-source-day/open-source-day/"
     },
     "blacklivesmatter": {
       "visible": false,