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

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Add mix.deps get before docs

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support/guides/install/dependencies.md

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+# Dependencies
+
+
+- [Debian / Ubuntu and derivatives](#debian--ubuntu-and-derivatives)
+- [Arch Linux](#arch-linux)
+- [Other distributions](#other-distributions)
+
+## Debian / Ubuntu and derivatives
+  1. On a fresh Debian/Ubuntu, as root user, install basic utility programs needed for the installation
+
+```
+sudo apt-get install curl sudo unzip vim
+```
+
+  2. It would be wise to disable root access and to continue this tutorial with a user with sudoers group access
+
+  3. Install certbot (choose instructions for nginx and your distribution) :
+     [https://certbot.eff.org/all-instructions](https://certbot.eff.org/all-instructions)
+  4. Install NodeJS 10.x (current LTS):
+     [https://nodejs.org/en/download/package-manager/#debian-and-ubuntu-based-linux-distributions](https://nodejs.org/en/download/package-manager/#debian-and-ubuntu-based-linux-distributions)
+  5. Install Erlang and Elixir:
+     [https://elixir-lang.org/install.html#unix-and-unix-like](https://elixir-lang.org/install.html#unix-and-unix-like)
+  6. Install PostGIS:
+     [https://postgis.net/install/](https://postgis.net/install/)
+  6. Run:
+
+```
+sudo apt update
+sudo apt install nginx postgresql postgresql-contrib openssl make git esl-erlang elixir postgis 
+```
+
+Now that dependencies are installed, before running MobiliZon you should start PostgreSQL:
+```
+sudo systemctl start postgresql
+```
+
+## Arch Linux
+
+  1. Run:
+
+```
+sudo pacman -S nodejs postgresql openssl git wget unzip base-devel npm nginx elixir postgis
+```
+
+Now that dependencies are installed, before running MobiliZon you should start PostgreSQL and Redis:
+```
+sudo systemctl start postgresql
+```
+
+## Other distributions
+
+Feel free to update this file in a pull request!