Move to yarn

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

support/guides/install/dependencies.md

@@ -18,6 +18,7 @@ sudo apt-get install curl sudo unzip vim
      [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 yarn, and be sure to have [a recent version](https://github.com/yarnpkg/yarn/releases/latest): [yarnpkg.com/en/docs/install#linux-tab](https://yarnpkg.com/en/docs/install#linux-tab)
   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:
@@ -39,7 +40,7 @@ sudo systemctl start postgresql
   1. Run:
 
 ```
-sudo pacman -S nodejs postgresql openssl git wget unzip base-devel npm nginx elixir postgis
+sudo pacman -S nodejs postgresql openssl git wget unzip base-devel yarn nginx elixir postgis
 ```
 
 Now that dependencies are installed, before running MobiliZon you should start PostgreSQL and Redis:

support/guides/install/install.md

@@ -77,12 +77,12 @@ cd js/
 and install the Javascript dependencies
  
 ```bash
-npm install
+yarn install
 ```
 
 Finally, build the front-end with 
 ```bash
-npm run build
+yarn run build
 ```
   
 ### Testing