refactor: replace custom CRM with Monica fork

docs/installation/providers/docker.md

@@ -0,0 +1,44 @@
+# Installing Monica on Docker <!-- omit in toc -->
+
+<img alt="Logo" src="https://upload.wikimedia.org/wikipedia/commons/thumb/4/4e/Docker_%28container_engine%29_logo.svg/915px-Docker_%28container_engine%29_logo.svg.png" width="290" height="69" />
+
+Monica can run with Docker images.
+
+- [Prerequisites](#prerequisites)
+- [Use Monica docker image](#use-monica-docker-image)
+- [Running the image with docker-compose](#running-the-image-with-docker-compose)
+
+## Prerequisites
+
+You can use [Docker](https://www.docker.com) and [docker-compose](https://docs.docker.com/compose/) to pull or build
+and run a Monica image, complete with a self-contained MySQL database.
+This has the nice properties that you don't have to install lots of software directly onto your system, and you can be up and running
+quickly with a known working environment.
+
+For any help about how to install Docker, see their [documentation](https://docs.docker.com/get-docker/).
+
+## Use Monica docker image
+
+The [standard `monica` image](https://hub.docker.com/_/monica/) can be run with the latest release of Monica.
+
+Run the container with the command below (don't change the username/password):
+
+```sh
+mysqlCid="$(docker run -d \
+ -e MYSQL_RANDOM_ROOT_PASSWORD=true \
+ -e MYSQL_DATABASE=monica \
+ -e MYSQL_USER=homestead \
+ -e MYSQL_PASSWORD=secret \
+ "mysql:5.7")"
+docker run -d \
+ --link "$mysqlCid":mysql \
+ -e DB_HOST=mysql \
+ -p 8080:80 \
+ monica
+```
+
+Wait for the migration db to complete, then go to [http://localhost:8080](http://localhost:8080).
+
+## Running the image with docker-compose
+
+See some examples of docker-compose possibilities in the [example section](https://github.com/monicahq/docker/tree/master/.examples).