docs: correct dotenv dep to dotenv-flow (#646)

* docs: correct `dotenv` dep to `dotenv-flow`

* docs: replace rest of `dotenv` -> `dotenv-flow`

docs/next/guides/fetching-data.mdx

@@ -12,12 +12,12 @@ Faust.js uses [GQty](https://gqty.dev/docs/react/fetching-data) as the primary w
 
 GQty works primarily based on TypeScript typings generated using introspection on your GraphQL API. Using WPGraphQL as your Headless WordPress API, you can enable introspection and then generate typings for GQty. You will need to do the following:
 
-1. Run `npm install -D @gqty/cli dotenv`
+1. Run `npm install -D @gqty/cli dotenv-flow`
 1. Create a `generate` script in your `package.json` that runs `gqty generate`.
 1. Create a `gqty.config.js` file at the root of your project. Use the following example config:
 
    ```js
-   require('dotenv').config();
+   require('dotenv-flow').config();
 
    /**
     * @type {import("@gqty/cli").GQtyConfig}

docs/release-notes.mdx

@@ -147,7 +147,7 @@ module.exports = withFaust({
 In the root of your project, alongside `package.json`, replace the `gqty.config.js` file with the following:
 
 ```js
-require('dotenv').config();
+require('dotenv-flow').config();
 
 /**
  * @type {import("@gqty/cli").GQtyConfig}

docs/tutorial/setup-faustjs.mdx

@@ -56,7 +56,7 @@ npm install --save-prod @faustjs/core @faustjs/next
 #### Dev Dependencies
 
 ```bash
-npm install --save-dev @gqty/cli dotenv
+npm install --save-dev @gqty/cli dotenv-flow
 ```
 
 ### Create `faust.config.js`
@@ -105,7 +105,7 @@ Replace the `NEXT_PUBLIC_WORDPRESS_URL` value with the URL of your WordPress sit
 We use [GQty](https://gqty.dev) as our GraphQL client. To configure GQty, we need to create a `gqty.config.js` file in the root of our project.
 
 ```js title=gqty.config.js
-require('dotenv').config();
+require('dotenv-flow').config();
 
 /**
  * @type {import("@gqty/cli").GQtyConfig}
@@ -186,7 +186,7 @@ Next, add the following `generate` script to your `package.json`:
   "devDependencies": {
     "@gqty/cli": "^1.0.4",
     "@types/react": "^17.0.15",
-    "dotenv": "^10.0.0",
+    "dotenv-flow": "^3.2.0",
     "typescript": "^4.3.5"
   }
 }