[various] adapt README.md

gravatar/README.md

@@ -30,12 +30,13 @@ Gravatar lets users self-rate their images to be used at appropriate audiences.
 See more information at [Gravatar][1].
 
 ## Alternative Configuration
-Open the `config/local.config.php` file and add "gravatar" to the list of activated addons:
+Open the `config/node.config.php` file and add "gravatar" to the list of activated addons:
 
-	'system' => [
-		...
-		'addon' => '...,gravatar'
+	'addons' => [
 		...
+		'gravatar' => [
+			admin => true,			
+		],
 	]
 
 You can add two configuration variables for the addon to the `config/gravatar.config.php` file:

libravatar/README.md

@@ -23,12 +23,13 @@ If no avatar was found for an email Libravatar can create some pseudo-random gen
 See examples at [Libravatar][1].
 
 ## Alternative Configuration
-Open the `config/local.config.php` file and add "libravatar" to the list of activated addons:
+Open the `config/node.config.php` file and add "libravatar" to the list of activated addons:
 
-    'system' => [
-        ...
-        'addon' => '...,libravatar'
+	'addons' => [
 		...
+		'libravatar' => [
+			admin => true,			
+		],
 	]
 
 You can add one configuration variables for the addon to the `config/libravatar.config.php` file:

mathjax/README.md

@@ -21,12 +21,13 @@ In case you want to use the CDN you can try the following URL as a quick start
 	http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS_HTML
 
 In case you don't want or can use the admin panel of Friendica you can activate
-the addon by adding _mathjax_ to the list in your `config/local.config.php` file
+the addon by adding _mathjax_ to the list in your `config/node.config.php` file
 
-    'system' => [
-        ...
-        'addon' => '...,mathjax'
+	'addons' => [
 		...
+		'mathjax' => [
+			admin => true,			
+		],
 	]
 
 and then providing the base URL after that in the `config/mathjax.config.php` file

openstreetmap/README.md

@@ -34,12 +34,13 @@ zoom level available.
 
 ## Alternative Configuration
 
-Open the `config/local.config.php` file and add "openstreetmap" to the list of activated addons.
+Open the `config/node.config.php` file and add "openstreetmap" to the list of activated addons.
 
-     'system' => [
-         ...
-         'addon' => '...,openstreetmap'
+	'addons' => [
 		...
+		'openstreetmap' => [
+			admin => true,			
+		],
 	]
 
 You can set configuration variables for the addon in the `config/openstreetmap.config.php` file:

piwik/README.md

@@ -22,12 +22,13 @@ The easiest way to configure this addon is by activating the admin panels of you
 
 If you don't want to use the admin panel, you can configure the addon through the `config/local.config.php` file.
 
-Open the `config/local.config.php` file and add "piwik" to the list of activated addons.
+Open the `config/node.config.php` file and add "piwik" to the list of activated addons.
 
-    'system' => [
-        ...
-        'addon' => '...,piwik'
+	'addons' => [
 		...
+		'piwik' => [
+			admin => true,			
+		],
 	]
 
 You can change 4 more configuration variables for the addon in the `config/piwik.config.php` file:

twitter/README.md

@@ -18,10 +18,11 @@ After the registration please enter the values for "Consumer Key" and "Consumer
 
 Open the `config/local.config.php` file and add "twitter" to the list of activated addons:
 
-    'system' => [
-        ...
-        'addon' => '...,twitter'
+	'addons' => [
 		...
+		'twitter' => [
+			admin => true,			
+		],
 	]
 
 Add your key pair to your `config/twitter.config.php` file.