Add hero section for case studies page

Author: Conor Okus

docs/.vuepress/config.js

@@ -151,6 +151,10 @@ module.exports = {
         text: 'Tutorials',
         link: '/tutorials/getting-started'
       },
+      {
+        text: 'Case Studies',
+        link: '/case-studies'
+      },
       {
         text: 'Blog',
         link: '/blog/'

docs/case-studies.md

@@ -0,0 +1,9 @@
+---
+cases: true
+sidebar: false
+heroText: "Case Studies"
+tagline: "A list of bitcoin applications building with LDK. If you’re using LDK we’d love to hear about your experience!"
+actionText: "Let us know!"
+actionLink: "https://github.com/orgs/lightningdevkit/discussions/1554"
+editLink: false
+---