docs: Removed heroku button from quickstart and fixed list index from Next.js documentation (#2333)

* Removed heroku section from quickstart

* Fixed list index order from nextjs docs

docs/content/quickstart/quick-start.md

@@ -2,10 +2,6 @@
 
 This document will guide you through setting up your Medusa server in a few minutes.
 
-Alternatively, you can use this button to deploy the Medusa server to Heroku directly:
-
-[![Deploy](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy?template=https://github.com/medusajs/medusa-starter-default/tree/feat/deploy-heroku)
-
 ## Prerequisites
 
 Medusa supports Node versions 14 and 16. You can check which version of Node you have by running the following command:

docs/content/starters/nextjs-medusa-starter.md

@@ -16,19 +16,19 @@ This document assumes you already have a Medusa server installed. If you don’t
 
 ## Installation
 
-1. Create a new Next.js project using the [Medusa starter template](https://github.com/medusajs/nextjs-starter-medusa):
+1\. Create a new Next.js project using the [Medusa starter template](https://github.com/medusajs/nextjs-starter-medusa):
 
 ```bash
 npx create-next-app -e https://github.com/medusajs/nextjs-starter-medusa my-medusa-storefront
 ```
 
-1. Change to the newly created directory `my-medusa-storefront` and rename the template environment variable file to use environment variables in development:
+2\. Change to the newly created directory `my-medusa-storefront` and rename the template environment variable file to use environment variables in development:
 
 ```bash
 mv .env.template .env.local
 ```
 
-1. Make sure the Medusa server is running, then run the local Next.js server:
+3\. Make sure the Medusa server is running, then run the local Next.js server:
 
 ```bash
 npm run dev