replaced all github flavored code blocks with fenced kramdown code blocks

configuration/ConfigFiles.md

@@ -14,11 +14,11 @@ Those files are placed in /rw, which survives VM restart, so can be used to cust
 
 -   `/rw/config/rc.local` - script run at VM startup. Good place to change some service settings, replace config files with its copy stored in /rw/config etc. Example usage:
 
-    ```
+    ~~~
     # Store bluetooth keys in /rw to keep them across VM restarts
     rm -rf /var/lib/bluetooth 
     ln -s /rw/config/var-lib-bluetooth /var/lib/bluetooth
-    ```
+    ~~~
 
 -   `/rw/config/qubes-ip-change-hook` - script run in NetVM after external IP change (or connection to the network)
 -   `/rw/config/qubes-firewall-user-script` - script run in ProxyVM after firewall update. Good place to write own custom firewall rules
@@ -31,7 +31,7 @@ GUI and audio configuration in dom0
 
 GUI configuration file `/etc/qubes/guid.conf` in one of few not managed by qubes-prefs nor Qubes Manager tool. Sample config (included in default installation):
 
-```
+~~~
 # Sample configuration file for Qubes GUI daemon
 #  For syntax go http://www.hyperrealm.com/libconfig/libconfig_manual.html
 
@@ -55,7 +55,7 @@ VM: {
     #allow_fullscreen = true;
   };
 };
-```
+~~~
 
 Currently supported settings: