Updated/added screenshots

1920p width

Signed-off-by: mMuck <git@muckies.com>

appinfo/info.xml

@@ -13,7 +13,8 @@
     <category>organization</category>
     <website>https://github.com/nextcloud/cookbook/</website>
     <bugs>https://github.com/nextcloud/cookbook/issues</bugs>
-    <screenshot small-thumbnail="https://raw.githubusercontent.com/nextcloud/cookbook/stable/img/screenshot-small.jpg">https://raw.githubusercontent.com/nextcloud/cookbook/stable/img/screenshot-small.jpg</screenshot>
+    <screenshot small-thumbnail="https://raw.githubusercontent.com/nextcloud/cookbook/stable/img/screenshot1-small.png">https://raw.githubusercontent.com/nextcloud/cookbook/stable/img/screenshot1.png</screenshot>
+		<screenshot>https://raw.githubusercontent.com/nextcloud/cookbook/stable/img/screenshot2.png</screenshot>
     <dependencies>
         <php min-version="7.3"/>
         <nextcloud min-version="19" max-version="21"/>