better documentation

docs/install/debian.md

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+---
+layout: default
+title: Debian
+permalink: /install/debian
+parent: Install
+---
+
+## Debian installation
+
+1. Install Node.js & yarn (**from root**)
+```bash
+curl -sL https://deb.nodesource.com/setup_12.x | bash -
+apt-get install -y nodejs
+curl -sL https://dl.yarnpkg.com/debian/pubkey.gpg |  apt-key add -
+echo "deb https://dl.yarnpkg.com/debian/ stable main" > /etc/apt/sources.list.d/yarn.list
+apt-get update && apt-get install yarn
+```
+<small>[source](https://github.com/nodesource/distributions/blob/master/README.md)</small>
+
+1. Install Gancio
+```bash
+yarn add gancio --prod
+```
+
+1. Setup with postgreSQL (optional as you can choose sqlite)
+```bash
+apt-get install postgresql
+# Create the database
+su postgres -c psql
+postgres=# create database gancio;
+postgres=# create user gancio with encrypted password 'gancio';
+postgres=# grant all privileges on database gancio to gancio;
+```
+
+1. Create a user to run gancio from
+```bash
+adduser gancio
+su gancio
+```
+
+1. Test & launch interactive setup
+```bash
+gancio --help
+gancio setup --config config.json
+```
+
+1. Start
+```bash
+gancio --help
+gancio start --config config.json
+```
+1. Point your web browser to [http://localhost:13120](http://localhost:13120) or where you selected during setup.
+
+1. [Setup nginx as a proxy](/install/nginx)
+
+1. Deploy in production  
+If you don't use the [docker way](/install/docker), in production you should use something like **[pm2](http://pm2.keymetrics.io/)**:
+
+```bash
+sudo yarn global add pm2
+pm2 gancio start --config config.json
+```