Move docs to mkdocs and improve them

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

docs/contribute/development.md

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+# Development
+
+Clone the repository:
+```bash
+# With HTTPS
+git clone https://framagit.org/framasoft/mobilizon && cd mobilizon
+
+# With SSH
+git clone git@framagit.org:framasoft/mobilizon.git && cd mobilizon
+```
+
+Run Mobilizon:
+
+  * with Docker and Docker-Compose (**Recommended**)
+  * without Docker and Docker-Compose (This involves more work on your part, use Docker and Docker-Compose if you can)
+
+## With Docker and Docker-Compose
+
+  * Install [Docker](https://docs.docker.com/install/#supported-platforms) and [Docker-Compose](https://docs.docker.com/compose/install/) for your system.
+  * Run `make start` to build, then launch a database container and an API container.
+  * Follow the progress of the build with `docker-compose logs -f`.
+  * Access `localhost:4000` in your browser once the containers are fully built and launched.
+
+## Without Docker and Docker-Compose
+
+  * Install dependencies:
+    * Elixir (and Erlang) by following the instructions at [https://elixir-lang.github.io/install.html](https://elixir-lang.github.io/install.html)
+    * [PostgreSQL]() with PostGIS
+    * Install NodeJS (we guarantee support for the latest LTS and later) ![](https://img.shields.io/badge/node-%3E%3D%2012.0+-brightgreen.svg)
+  * Start services:
+    * Start postgres
+  * Setup services:
+    * Make sure the postgis extension is installed on your system.
+    * Create a postgres user with database creation capabilities, using the
+      following: `createuser -d -P mobilizon` and set `mobilizon` as the password.
+  * Install packages
+    * Fetch backend Elixir dependencies with `mix deps.get`.
+    * Go into the `cd js` directory, `yarn install` and then back `cd ../`
+  * Setup
+    * Create your database with `mix ecto.create`.
+    * Create the postgis extension on the database with a postgres user that has
+      superuser capabilities: `psql mobilizon_dev`
+
+      ``` create extension if not exists postgis; ```
+
+    * Run migrations: `mix ecto.migrate`.
+  * Start Phoenix endpoint with `mix phx.server`. The client development server will also automatically be launched and will reload on file change.
+
+Now you can visit [`localhost:4000`](http://localhost:4000) in your browser
+and see the website (server *and* client) in action.