Simplify Vagrant config

doc/vagrant.markdown

@@ -1,64 +1,10 @@
 Run Kanboard with Vagrant
 =========================
 
-Vagrant is used to test Kanboard in different environments.
+You can try Kanboard with Vagrant very easily:
 
-Several configurations are available:
+- Clone the project from the git repository
+- Run `vagrant up`
+- You can access to the application by using the URL `http://localhost:8001/`
 
-- Ubuntu 14.04 LTS
-- Debian 8
-- Debian 7
-- Debian 6
-- Centos 7
-- Centos 6.7
-- Freebsd 10
-
-The installation process is not fully automated for all VM, manual configuration can be required.
-
-To use those configurations, you have to install the **last version of Virtualbox and Vagrant**.
-
-Standard boxes can be downloaded from Vagrant:
-
-```bash
-vagrant box add ubuntu/trusty64
-vagrant box add debian/jessie64
-vagrant box add debian/wheezy64
-vagrant box add bento/debian-6.0.10
-vagrant box add centos/7
-vagrant box add bento/centos-6.7
-vagrant box add freebsd/FreeBSD-10.2-STABLE
-```
-
-### Example with Ubuntu and Sqlite
-
-If you want to test Kanboard on Ubuntu with Sqlite:
-
-```bash
-vagrant up sqlite
-```
-
-The current directory is synced to the Apache document root.
-
-Composer dependencies have to be there, so if you didn't run `composer install` on your host machine you can also do it on the guest machine.
-
-Each box has its own TCP port:
-
-- ubuntu: http://localhost:8001/
-- debian8: http://localhost:8002/
-- debian7: http://localhost:8003/
-- debian6: http://localhost:8004/
-- centos7: http://localhost:8005/
-- centos6: http://localhost:8006/
-- freebsd10: http://localhost:8007/
-
-Available boxes are:
-
-- `vagrant up ubuntu`
-- `vagrant up debian8`
-- `vagrant up debian7`
-- `vagrant up debian6`
-- `vagrant up centos7`
-- `vagrant up centos6`
-- `vagrant up freebsd10`
-
-Any specific configuration has to be done manually (Postgres or Mysql).
+The virtual machine is based on Ubuntu 14.04 with PHP 5.5.