add China Unicom case study and update Case Study homepage with new f… (#13557)

* add China Unicom case study and update Case Study homepage with new features

* Update index.html

* Update index.html

* Update index.html

* updates

content/en/case-studies/appdirect/index.html

@@ -1,11 +1,17 @@
 ---
 title: AppDirect Case Study
+
+linkTitle: AppDirect
 case_study_styles: true
 cid: caseStudies
 css: /css/style_case_studies.css
+logo: appdirect_featured_logo.png
+featured: true
+weight: 4
+quote: >
+   We made the right decisions at the right time. Kubernetes and the cloud native technologies are now seen as the de facto ecosystem.
 ---
 
-
 <div class="banner1" style="background-image: url('/images/CaseStudy_appdirect_banner1.jpg')">
   <h1> CASE STUDY:<img src="/images/appdirect_logo.png" class="header_logo" style="margin-bottom:-2%"><br> <div class="subhead" style="margin-top:1%;font-size:0.5em">AppDirect: How AppDirect Supported the 10x Growth of Its Engineering Staff with Kubernetess
 </div></h1>