docs(docs): add page icon frontmatter to problem pages

apps/docs/content/(01-linear-structures)/binary-search/35-search-insert-position.mdx

@@ -1,6 +1,7 @@
 ---
 title: '35. Search Insert Position'
 description: Given a sorted array of distinct integers and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in order
+icon: line-dot-left-horizontal
 sidebar:
   label: 'Search Insert Position'
   badge: 'Easy'