Move Docker set up to its own file

docs/docker.md

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+#### Docker install (if you don't have docker and docker-compose installed)
+##### install Docker and Docker compose
+You need to install Docker and Docker Compose.
+* *Note:* Docker and Docker Compose binaries from Docker itself are proprietary software based entirely upon
+free software. If you feel more comfortable, you may build them from source.
+
+* *Note 2:* For Debian, the Docker package is simply too out of date to be usable. 
+Even the version for latest Ubuntu LTS  is too old. For reliability, we strongly
+recommend using the Docker debian feed from docker itself OR making sure you keep your
+own build up to date.
+
+##### Add yourself to the docker group
+Adding yourself as a Docker group user as follows:
+
+`sudo usermod -aG docker $USER`
+
+You will likely need to logout and log back in again.
+ 
+#### Build your docker-container and start it up for initial set up.
+We'll keep this running in the console we'll call **console 1**
+```
+./dc build
+./dc up
+```
+#### System configuration
+There are a number of steps for configuring your Houdini instance for startup
+##### Start a new console we'll call **console 2**.
+
+##### In console 2, copy the env template to your .env file
+   ```
+   cp .env.template .env
+   ```
+##### In console 2, run the following and copy the output to you .env file to set you `DEVISE_SECRET_KEY` environment variable.   
+`./run rake secret # copy this result into your DEVISE_SECRET_KEY`
+
+##### In console 2, , run the following and copy the output to you .env file to set you `SECRET_TOKEN` environment variable.
+```
+./run rake secret # copy this result into your SECRET_TOKEN
+```
+
+##### Set the following secrets in your .env file with your Stripe account information
+- `STRIPE_API_KEY` with your Stripe PRIVATE key
+- `STRIPE_API_PUBLIC` with your Stripe PUBLIC key
+
+##### You SHOULD set your AMAZON s3 information (optional but STRONGLY recommended)
+If you don't, file uploads WILL NOT WORK but it's not required.
+
+##### In console 2,  install yarn
+`./run yarn`
+
+##### In console 2, fill the db
+`./run rake db:create db:structure:load db:seed test:prepare` 
+
+##### Set up mailer info 
+You can set this in `config/default_organization.yml` or better yet, make a copy with your own org name and add that to your .env file as `ORG_NAME`
+If you need help setting up your mailer, visit `config/environment.rb` where the settings schema is verified and documented.
+
+#### Startup
+##### Switch back to console 1 and run `Ctrl-c` to end the session.
+
+##### In console 1, restart the containers
+`./dc up`
+
+##### In console 2, run:
+`./run yarn watch`
+
+##### You can go to http://localhost:5000
+
+To get started, register your nonprofit using the "Get Started" link.