docs: deploy to AWS Amplify

docs/docs/build_and_deploy/deploy_aws.md

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+# Deploy to AWS Amplify
+
+This guide covers how to deploy Composable UI to AWS Amplify
+
+##  Prerequisites
+
+- You'll need an AWS account, sign up here: https://aws.amazon.com/
+- You'll need to fork the Composable UI github repository.
+   - This is required since later on you'll be authorizing AWS Amplify access to your forked copy of Composable UI.
+
+## Create a new AWS Amplify app
+- Sign into your AWS console
+- Go to the  AWS Amplify service. It can be found by searching for "AWS Amplify" in the search bar.
+- Once in the AWS Amplify dashboard, click on `Create new app`.
+
+### Configure the new app
+- Select `GitHub` as the Git provider, and click `Next`.
+- Select your Composable UI repository from the `Select a repository` search bar.
+   - Note: You may need to click on the `Update GitHub permissions` button to authorize AWS access to your desired github organization and specific github repository.
+- In `Select a branch`, select `main`.
+- Select the `My app is a monorepo` checkbox. 
+- Set the `Monorepo root directory` to `composable-ui`.
+- Click `Next`
+
+On the `App settings` screen:
+- Click `Edit YML file`, and paste the below yml file into the editor, then click `Save`:
+```yml
+version: 1
+applications:
+  - frontend:
+      phases:
+        preBuild:
+          commands:
+            - echo 'node-linker=hoisted' >> .npmrc
+            - npm install -g pnpm
+            - pnpm install
+        build:
+          commands:
+            - env >> .env
+            - npx turbo run build --filter=composable-ui
+      artifacts:
+        baseDirectory: .next
+        files:
+          - '**/*'
+      cache:
+        paths:
+          - $(pnpm store path)
+      buildPath: composable-ui
+    appRoot: composable-ui
+
+```
+- The Environment Variables are configured in the `Advanced Settings` section. We will skip this for now, and come back to this in a later step.
+- Click `Next`.
+- Click `Save and deploy`.
+
+The deployment will succeed, however, we now need to setup the [Environment Variables](#configure-environment-variables).
+
+### Configure Environment Variables
+
+We need to obtain the domain that the app is being deployed on: 
+- Go to the main dashboard of your app in AWS Amplify.
+- Click on `Hosting` => `Custom domains` and copy the URL to your clipboard. See the screenshot below for an example.
+
+![image](/img/custom-domains.png)
+
+Now go to `Hosting` => `Environment variables`. We need to configure two environment variables for NextAuth.js:
+- Create environment variable `NEXTAUTH_URL` and paste in the value we copied earlier from the Custom domains screen.
+- Create environment variable `NEXTAUTH_SECRET`. This value is used by NextAuth.js to encrypt auth cookies. See the[ NextAuth.js docs](https://next-auth.js.org/configuration/options#nextauth_secret) for creating a strong secret. You can also set this to something like "changeme" and revisit this later on, prior to launching to production.
+
+### Redeploy
+
+After setting the `NEXTAUTH_URL` and `NEXTAUTH_SECRET` environment variables, the app is now ready to be redeployed:
+- Go to the  dashboard of your app, and click on the `main` deployment.
+- Click the `Redeploy this version` button.
+
+When the app finishes deployment, your Composable UI storefront is ready to use! Go back to the dashboard of your app, and click `Visit Deployed URL`. 
+
+### Next steps
+
+Visit the [integrations guide](../integrations/overview.md) to set up additional features like product filtering, product promotions, content orchestration, and payments.
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