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/nav/index.html

@@ -1,8 +1,15 @@
 ---
 title: Nav Case Study
+
+linkTitle: Nav
 case_study_styles: true
 cid: caseStudies
 css: /css/style_case_studies.css
+logo: nav_featured_logo.png
+featured: true
+weight: 3
+quote: >
+   The community is absolutely vital: being able to pass ideas around, talk about a lot of the similar challenges that we’re all facing, and just get help. I like that we’re able to tackle the same problems for different reasons but help each other along the way.
 ---
 
 <div class="banner1" style="background-image: url('/images/CaseStudy_nav_banner1.jpg')">