Update installation docs

docs/index.md

@@ -14,9 +14,7 @@ for building awesome APIs, websites and web applications.
 
 ## Installation
 
-* [Composer](installation.md#installation-via-composer)
-* [Docker](installation.md#installation-via-docker)
-* [Vagrant](installation.md#installation-via-vagrant)
+See [here](installation.md)
 
 ## Support
 

docs/installation.md

@@ -21,8 +21,8 @@ cd my-app
 sudo chown -R www-data tmp/
 sudo chown -R www-data logs/
 
-sudo chmod -R 760 tmp/
-sudo chmod -R 760 logs/
+sudo chmod -R g+w tmp/
+sudo chmod -R g+w logs/
 
 chmod +x bin/console.php
 ```
@@ -35,10 +35,20 @@ Start the setup script and follow the instructions:
 php bin/console.php setup
 ```
 
+**Note:** The `setup` command is useful for setting up a project on 
+the **local development machine**. For continuous integration 
+or continuous delivery, you should use a **build and deployment pipeline**
+instead.
+
 **Step 4:** Start the internal webserver
 
 ```
 composer start
 ```
 
 Then navigate to: <http://localhost:8080/>
+
+**Note:** The PHP internal webserver is designed for
+application development, testing or application demonstrations.
+It is not intended to be a full-featured web server. 
+It should not be used on a public network.