docs: add companies frontmatter, schema, and rendering in badges & appendix pages

apps/docs/content/(03-hierarchical)/tree-bfs/1448_count-good-nodes-in-binary-tree.mdx

@@ -9,6 +9,9 @@ topics:
   - { name: "Binary Tree", slug: "binary-tree" }
 video: "7cp5imvDzl4"
 issue: "https://github.com/prdlk/leetcode/issues/108"
+companies:
+  - { name: "josh technology", period: "Six Months", frequency: 74 }
+  - { name: "Google", period: "Six Months", frequency: 11.8 }
 sidebar:
   label: 'Count Good Nodes in Binary Tree'
   badge: 'Medium'