docs: add application goal and project setup instructions to documentation

overview.md

@@ -9,14 +9,16 @@ Okay, let's set up a skeleton Fastify API project with Prisma to interact with a
 
 **Project Setup Steps:**
 
-1.  **Create Project Directory & Initialize:**
+1. **Create Project Directory & Initialize:**
+
     ```bash
     mkdir finance-api
     cd finance-api
     npm init -y
     ```
 
-2.  **Install Dependencies:**
+2. **Install Dependencies:**
+
     ```bash
     # Runtime dependencies
     npm install fastify @prisma/client dotenv
@@ -408,4 +410,4 @@ Okay, let's set up a skeleton Fastify API project with Prisma to interact with a
     curl http://localhost:3050/api/bank-account/YOUR_ACCOUNT_ID
     ```
 
-This skeleton provides the core structure. You can build upon this by adding more robust error handling, input validation (using Fastify's built-in schema validation), authentication/authorization, more complex queries, and organizing routes into separate files/plugins as the application grows.
+This skeleton provides the core structure. You can build upon this by adding more robust error handling, input validation (using Fastify's built-in schema validation), authentication/authorization, more complex queries, and organizing routes into separate files/plugins as the application grows.