Add mkdocs and change menu names to avoid margin collisions (#468)

docs/install/yii2-application-template.md

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+2amigos Application Template
+============================
+
+This Application Template is our proposed structure for your Yii2 applications. It makes use 
+of a special library named `ConfigKit`
+
+> For further information regarding the use of this template, please visit its 
+[README file](https://github.com/2amigos/yii2-app-template).
+
+Step 1 - Install The Application template
+-----------------------------------------
+
+We will assume that you have composer installed globally on your computer and also the 
+`fxp/composer-asset/plugin:^1.3` that is required for all Yii2 apps.
+
+```bash
+composer create-project --prefer-dist --stability=dev 2amigos/yii2-app-template your-site-name
+```
+
+Step 2 - Configure your application
+-----------------------------------
+
+Go to the `config/web/modules` folder and create a new PHP file named `user.php`. Then on in its 
+contents write the configuration for the module: 
+
+
+```php
+<?php 
+
+return [
+    'class' => Da\User\Module::class
+];
+```
+
+Step 3 - Apply database schema migrations
+-----------------------------------------
+
+This is obvious extension like our which deals with users, roles, permissions, etc. have to use some database.
+Our migrations are namespaced and available in `Da\User\Migration` namespace.
+
+Before starting to work with database, please ensure you have deleted `m130524_201442_init.php` migration file
+which comes from the default installation of the Advanced Application Template. It's located at
+`%PROJECT_DIR%/console/migrations/m130524_201442_init.php` path.
+
+There are two ways to apply migrations of this extension, the first one:
+
+```php
+./yii migrate --migrationNamespaces=Da\\User\\Migration
+./yii migrate --migrationPath=@yii/rbac/migrations
+./yii migrate
+```
+
+First command applies migration set of the user module, and the second one is for application migrations.
+
+> Note, you cannot mix two ways: choose one of them, and stick with it.
+
+The second way is more comfortable, and you don't have to remember to launch first command every time you obtain
+new version of our extension. First of all add the following lines to the file
+`%PROJECT_DIR%/console/config/main.php`:
+
+```php
+return [
+    // ...
+    'controllerMap' => [
+        'migrate' => [
+            'class' => \yii\console\controllers\MigrateController::class,
+            'migrationNamespaces' => [
+                'Da\User\Migration',
+            ],
+            'migrationPath' => [
+                '@app/migrations',
+                '@yii/rbac/migrations', 
+            ],
+        ],
+    ],
+    // ...
+];
+```
+
+This basically instructs your application to always try to use migrations from the given namespace. Which again
+is very convenient way to track new migration classes coming from this and possibly other extensions and sources.
+
+
+
+> Namespaced migrations were introduced in Yii 2.0.10, so before using them consider updating your framework
+> installation version.
+
+© [2amigos](http://www.2amigos.us/) 2013-2019
+
+