docs: updated README.md

Updates README.md according to installer.sh changes

Signed-off-by: Stephan Wendel <me@stephanwe.de>

README.md

@@ -26,7 +26,6 @@ So, this will be the 'lookout point' for your Printer.
     cd ~
     git clone https://github.com/mainsail-crew/crowsnest.git
     cd ~/crowsnest
-    make config
     sudo make install
 
 _This is not tested on other Distributions. If you test that on other Distributions,\
@@ -58,6 +57,12 @@ or
 
     make help
 
+For advanced users it is possible to configure the installer.
+
+Simply run:
+
+    make config
+
 ---
 
 ## Simple Configuration