Create deploying to production documentation

docs/deploying-to-production.md

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+# Deploying to production
+
+## Getting started
+
+The easiest way to get started is deploying the application to Heroku. Before creating the app you need three accounts: [Heroku](https://heroku.com/), [Stripe](https://stripe.com/fi) and [MapBox](https://www.mapbox.com/). Creating the accounts is free unless you start heavily using them. 
+
+Read more from [detailed Heroku instructions](#deploying-to-heroku) with a deploy-to-Heroku
+button.
+
+In other production environments, make sure that you have [Node.js](https://nodejs.org/) and
+[Yarn](https://yarnpkg.com/) installed. You will also need accounts to Stripe and MapBox. 
+
+After this you need to do the following steps:
+
+1.  [Set environment variables](#enviroment-variables)
+2.  [Build the app](#building-the-app)
+3.  [Run the node server](#starting-the-app)
+
+### Enviroment variables
+
+To deploy the application add at least the following variables:
+
+| Variable                             | Description                                                                                                                                                                                                                                                                                       |
+| ------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| `NODE_ENV`                           | Use value 'production' for production.                                                                                                                                                                                                                                                            |
+| `PORT`                               | Must be set if the production environment doesn't set it by default. Not needed in Heroku.                                                                                                                                                                                                        |
+| `REACT_APP_SHARETRIBE_SDK_CLIENT_ID` | Client ID (API key) you can check from [Flex Console](https://flex-console.sharetribe.com/login/). You will get this from the Sharetribe team.                                                                                                                                                    |
+| `REACT_APP_STRIPE_PUBLISHABLE_KEY`   | Stripe publishable API key for generating tokens with Stripe API. It can be found from Stripe [API keys](https://dashboard.stripe.com/account/apikeys) page. Make sure to toggle _"View test data"_ on if you don't want to use real money yet. The secret key needs to be added to Flex Console. |
+| `REACT_APP_MAPBOX_ACCESS_TOKEN`      | Sign up for Mapbox and go to [account page](https://www.mapbox.com/account/access-tokens). Then click `Create access token`. For more information see the [Integrating to map providers](./map-providers.md) documentation.                                                                       |
+| `REACT_APP_CANONICAL_ROOT_URL`       | Canonical root URL of the marketplace. E.g. https://the-name-of-your-app.herokuapp.com or your actual domain. This is needed for social media sharing and SEO optimization.                                                                                                                       |
+
+There are also some other variables that can be used. See the
+[Enviroment configuration variables](./env.md) documentation for more information.
+
+### Building the app
+
+Running the following command builds the app for production to the build folder. It correctly
+bundles React in production mode and optimizes the build for the best performance.
+
+`yarn build`
+
+After this, your app is ready to be deployed.
+
+### Starting the app
+
+Start the server:
+
+`yarn start`
+
+## Deploying to Heroku
+
+* [Forking the repository](#forking-the-repository)
+* [Creating new app](#creating-new-app)
+* [Connect GitHub to Heroku](#connect-github-to-heroku)
+* [Heroku settings](#heroku-settings)
+  * [Updating enviroment variables](#updating-enviroment-variables)
+  * [Domains and certificates](#domains-and-certificates)
+* [Heroku logs](#heroku-logs)
+
+Before creating the app you need three accounts: [Heroku](https://heroku.com/), [Stripe](https://stripe.com/fi) and [MapBox](https://www.mapbox.com/). Creating the accounts is free unless you start heavily using them.
+
+### Forking the repository
+
+When deploying to Heroku you should use a forked repository. This makes it possible to make
+[manual deploys](https://devcenter.heroku.com/articles/github-integration#manual-deploys) after
+changes to environment variables.
+
+If you haven't done this already see [Customization guide](./customization-guide.md#fork-the-repository) for more
+instructions.
+
+### Creating a new app
+
+The easiest way is to click the _"Deploy to Heroku"_ button (check the root folder in your forked
+repository) and fill in the needed information.
+
+After deploying you will find your app from your Heroku [dashboard](https://dashboard.heroku.com/).
+If you click your application you will see Overview and some other tabs.
+
+If you don't want to use the deploy button you can also manually create a new application in Heroku
+dashboard but then you have to manually set all the environment variables. If you prefer using the
+command line you can also use [Heroku CLI](https://devcenter.heroku.com/articles/git).
+
+### Connect GitHub to Heroku
+
+Connecting your GitHub account to Heroku makes it possible to do automatic and manual deploys in the
+dashboard using GitHub branches.
+
+1.  In Heroku dashboard go to _Deploy tab_ and find _Deployment method_ section.
+2.  Click  _Connect to GitHub_ button. After that, you will see _Connect to GitHub_ section.
+3.  Search the repository you have forked to your account and click connect.
+
+![Connect GitHub to Heroku](./assets/deploying-to-production/heroku-connect-git.png)
+
+After this, you can enable automatic deploys from specific GitHub branch or do the manual deploy
+from any branch in the repository.
+
+Read more from Heroku docs:
+
+* [GitHub Integration](https://devcenter.heroku.com/articles/github-integration)
+
+### Heroku settings
+
+In the _Settings tab_ you can manage your application's information, set it to maintenance mode and
+delete the app if needed.
+
+#### Updating enviroment variables
+
+In the _Settings tab_ click _"Reveal Config Vars"_ button to see the applications environment variables.
+Click edit to update them or add new ones if needed.
+
+> **NOTE:** If you change these variables, you need to deploy the app again.
+
+![Heroku settings](./assets/deploying-to-production/heroku-config-vars.png)
+
+#### Domains and certificates
+
+Heroku manages SSL certificates automatically for new applications. You can change your domain and SSH settings in the _Settings tab_.
+
+Read more from Heroku docs:
+
+* [Custom Domain Names for Apps](https://devcenter.heroku.com/articles/custom-domains)
+* [Manually Acquiring an SSL/TLS Certificate](https://devcenter.heroku.com/articles/acquiring-an-ssl-certificate)
+
+![Heroku settings](./assets/deploying-to-production/heroku-domains.png)
+
+### Heroku logs
+
+You can find your application's logs by clicking button _"More"_ in the upper right corner and
+selecting _"View logs"_ from the opening dropdown. Logs can be useful if there are problems when
+deploying the app.
+
+![Heroku logs](./assets/deploying-to-production/heroku-logs.png)