convert spoiler language and towards deobfuscation language

2012/endoh1/README.md

@@ -259,7 +259,7 @@ a usage of `I` (complex's imaginary unit), but I bet this is cygwin's issue;
 it is surely a C99 feature.
 
 
-### Obfuscation w/ Spoiler
+### Deobfuscation
 
 First of all, the source code itself serves as an initial configuration.
 Preprocessing directives (such as `#include`)'s `#` serve as walls.

2012/endoh1/index.html

@@ -554,7 +554,7 @@ used to clear screen and move cursor to home.</p>
 and gcc-4.5.3 and clang-3.1 on Cygwin. On Cygwin, gcc and clang complain about
 a usage of <code>I</code> (complex’s imaginary unit), but I bet this is cygwin’s issue;
 it is surely a C99 feature.</p>
-<h3 id="obfuscation-w-spoiler">Obfuscation w/ Spoiler</h3>
+<h3 id="deobfuscation">Deobfuscation</h3>
 <p>First of all, the source code itself serves as an initial configuration.
 Preprocessing directives (such as <code>#include</code>)’s <code>#</code> serve as walls.</p>
 <p>This program uses <code>double complex</code> to represent any 2D vector. But, note that