(doc) update README.md and client package.json

- specify nodejs version
- clearer setup process
- cleanup of phoenix doc artifacts
- prioritize manual install

README.md

 # Mobilizon
 
-## Development
-
-### Docker
+Your federated organization and mobilization platform. Gather people with a convivial, ethical, and emancipating tool.
 
-Just run
-```
-docker-compose up -d
-```
-to start a database container, an API container and the front-end dev container running on localhost:80
+## Development
 
 ### Manual
 
 #### Server
 
-  * Install Elixir (and Erlang) by following the instructions at [https://elixir-lang.github.io/install.html](https://elixir-lang.github.io/install.html)
-  * Install PostgreSQL
-  * Start postgres and make sure the postgis extension is installed.
-  * Create a postgres user with database creation capabilities, using the
-    following: `createuser -d -P elixir` and set `elixir` as the password.
-  * Fetch dependencies with `mix deps.get`.
-  * 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`.
+  * Install dependencies:
+    * Elixir (and Erlang) by following the instructions at [https://elixir-lang.github.io/install.html](https://elixir-lang.github.io/install.html)
+    * Fetch backend Elixir dependencies with `mix deps.get`.
+    * PostgreSQL
+  * 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 elixir` and set `elixir` as the password.
+    * 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`.
 
 Now you can visit [`localhost:4000`](http://localhost:4000) from your browser
@@ -37,21 +35,18 @@ and see the website (server *and* client) in action.
 If you plan to specifically change the client side (frontend), do the following
 once the server is running:
 
-  * Install the latest version of NodeJS
-  * Change directory to `js/`.
-  * Install JavaScript package dependencies: `npm install`.
-  * Run the developement server in watch mode: `npm run dev`. This will open a
-    browser on [`localhost:8080`](http://localhost:8080) that gets
-    automatically reloaded on change.
+  * Install the latest version of NodeJS ![](https://img.shields.io/badge/node-%3E%3D%2011.4.0-brightgreen.svg)
+  * Change directory to `js/` and do:
+    * Install JavaScript package dependencies: `npm install`.
+    * Run the developement server in watch mode: `npm run dev`. This will open a
+      browser on [`localhost:8080`](http://localhost:8080) that gets
+      automatically reloaded on change.
 
-## Production
+### Docker
 
-Ready to run in production? Please [check our deployment guides](http://www.phoenixframework.org/docs/deployment).
+Just run `docker-compose up -d` to start a database container, an API container and the front-end dev container running on localhost.
 
 ## Learn more
 
-  * Official website: http://www.phoenixframework.org/
-  * Guides: http://phoenixframework.org/docs/overview
-  * Docs: https://hexdocs.pm/phoenix
-  * Mailing list: http://groups.google.com/group/phoenix-talk
-  * Source: https://github.com/phoenixframework/phoenix
+  * Official website: https://joinmobilizon.org/
+  * Source: https://framagit.org/framasoft/mobilizon

js/package.json

@@ -2,6 +2,9 @@
   "name": "mobilizon",
   "version": "0.1.0",
   "private": true,
+  "engines" : {
+    "node" : ">=11.4.0" 
+  },
   "scripts": {
     "dev": "vue-cli-service serve",
     "build": "vue-cli-service build --modern",