feat: update TableOfContents component for improved heading indentation and add new post "Qui Sumus"

lib/posts.ts

@@ -33,7 +33,7 @@ export interface PostMeta {
 }
 
 function extractHeadings(content: string): Heading[] {
-  const regex = /^(#{2,3})\s+(.+)$/gm;
+  const regex = /^(#{1,3})\s+(.+)$/gm;
   const headings: Heading[] = [];
   let match;
   while ((match = regex.exec(content)) !== null) {