replace ascii logo by png logo (search engines don't like the ascii version

Signed-off-by: Nico Schottelius <nico@brief.schottelius.org>

docs/web/cdist.mdwn

@@ -1,19 +1,6 @@
 [[!meta title="cdist - usable configuration management"]]
 
-     
-                 ..          .       .x+=:.        s   
-               dF           @88>    z`    ^%      :8  
-              '88bu.        %8P        .   <k    .88 
-          .   '*88888bu      .       .@8Ned8"   :888ooo
-     .udR88N    ^"*8888N   .@88u   .@^%8888"  -*8888888
-    <888'888k  beWE "888L ''888E` x88:  `)8b.   8888
-    9888 'Y"   888E  888E   888E  8888N=*8888   8888
-    9888       888E  888E   888E   %8"    R88   8888
-    9888       888E  888F   888E    @8Wou 9%   .8888Lu=
-    ?8888u../ .888N..888    888&  .888888P`    ^%888*
-     "8888P'   `"888*""     R888" `   ^"F        'Y" 
-       "P'        ""         ""  
-     
+![cdist-logo](cdist-logo.png "cdist logo")
 
 [[!toc levels=3]]