Clean up

docs.it4i/index.md

@@ -3,19 +3,12 @@ Documentation
 
 Welcome to IT4Innovations documentation pages. The IT4Innovations national supercomputing center operates supercomputers [Salomon](/salomon/introduction/) and [Anselm](/anselm-cluster-documentation/introduction/). The supercomputers are [available](get-started-with-it4innovations/applying-for-resources/) to academic community within the Czech Republic and Europe and industrial community worldwide. The purpose of these pages is to provide a comprehensive documentation on hardware, software and usage of the computers.
 
-!!! warning "Reminder"
-    [History of Downtimes](downtimes_history/)
-
  How to read the documentation
 ------------------------------
 
-1. Read the list in the left column. Select the subject of interest. Alternatively, use the Search box in the upper right corner.
-2. Read the CONTENTS in the upper right corner.
-3. Scan for all the yellow bulb call-outs on the page.
-4. Read the details if still more information is needed. **Look for examples** illustrating the concepts.
-
-!!! Note "Note"
-	The call-out.   Focus on the call-outs before reading full details.
+1. Read the list in the left column. Select the subject of interest. Alternatively, use the Search in the upper right corner.
+1. Scan for all the notes and reminders on the page.
+1. Read the details if still more information is needed. **Look for examples** illustrating the concepts.
 
 Getting Help and Support
 ------------------------
@@ -29,7 +22,7 @@ Required Proficiency
 !!! Note "Note"
 	You need basic proficiency in Linux environment.
 
-In order to use the system for your calculations, you need basic proficiency in Linux environment. To gain the proficiency, we recommend you reading the [introduction to Linux](http://www.tldp.org/LDP/intro-linux/html/) operating system environment and installing a Linux distribution on your personal computer. A good choice might be the [Fedora](http://fedoraproject.org/) distribution, as it is similar to systems on the clusters at IT4Innovations. It's easy to install and use. In fact, any distribution would do.
+In order to use the system for your calculations, you need basic proficiency in Linux environment. To gain the proficiency, we recommend you reading the [introduction to Linux](http://www.tldp.org/LDP/intro-linux/html/) operating system environment and installing a Linux distribution on your personal computer. A good choice might be the [CentOS](http://www.centos.org/) distribution, as it is similar to systems on the clusters at IT4Innovations. It's easy to install and use. In fact, any distribution would do.
 
 !!! Note "Note"
 	Learn how to parallelize your code!