fix README headers

README.md

@@ -31,8 +31,6 @@ sql:
 
 ## Getting started
 
-# Getting started with PostgreSQL
-
 This tutorial assumes that the latest version of sqlc is
 [installed](https://docs.sqlc.dev/en/latest/overview/install.html) and ready to use.
 
@@ -48,7 +46,7 @@ an optional feature that improves sqlc's query analysis in many cases, but you
 can turn it off simply by removing the `cloud` and `database` sections of your
 configuration.
 
-## Setting up
+### Setting up
 
 Create a new directory called `sqlc-tutorial` and open it up.
 
@@ -94,7 +92,7 @@ And finally, set the `SQLC_AUTH_TOKEN` environment variable:
 export SQLC_AUTH_TOKEN="<your sqlc auth token>"
 ```
 
-## Schema and queries
+### Schema and queries
 
 sqlc needs to know your database schema and queries in order to generate code.
 In the same directory, create a file named `schema.sql` with the following
@@ -150,7 +148,7 @@ WHERE id = $1
 RETURNING *;
 ```
 
-## Generating code
+### Generating code
 
 You are now ready to generate code. You shouldn't see any output when you run
 the `generate` subcommand, unless something goes wrong:
@@ -171,7 +169,7 @@ source code. These files comprise a Go package named `tutorial`:
     ├── query_sql.ts
 ```
 
-## Using generated code
+### Using generated code
 
 You can use your newly-generated code package from any TypeScript program.
 Create a file named `src/main.ts` and add the following contents: