feat: Update homepage jumbotron for accessibility

content/home/_index.md

@@ -21,7 +21,7 @@ links:
     - text: Business Value
 container: container-fluid
 lastmod: 2022-04-29T14:50:37.859Z
-header_wrapper_class: header-wrapper header-anniversary-bg-img header-default-bg-img
+header_wrapper_class: header-wrapper header-anniversary-bg-img header-dark-bg-img
   featured-jumbotron-bottom-shape
 description: The Eclipse Foundation provides our global community of individuals and
   organizations with a mature, scalable, and business-friendly environment for

less/_variables.less

@@ -10,3 +10,5 @@
  * 
  * SPDX-License-Identifier: EPL-2.0
 */
+
+@header-dark-bg-img: url('images/jumbotron/home-jumbo-image.jpg');
\ No newline at end of file

less/pages/homepage.less

@@ -56,4 +56,8 @@
 
 .featured-jumbotron h1:after {
   border-color: #f7941e;
+}
+
+.header-dark-bg-img {
+  background-image: @header-dark-bg-img;
 }
\ No newline at end of file