convert spoiler language and towards deobfuscation language

2018/poikola/README.md

@@ -65,7 +65,7 @@ So I had to sit down and solve those tricky questions with Nano and a C
 compiler.
 
 
-### Little spoilers:
+### A bit of deobfuscation:
 
 Basically, the program draws animated ASCII art of the Big Dipper using Annie
 Jump Cannon's spectral classification system of stars and I think the colors of
@@ -121,7 +121,7 @@ mostly is okay. YMMV, as they say.
 Please do not feed little babies chocolate.
 
 
-### Major spoilers:
+### Major deobfuscation:
 
 I incorporated the [Fletcher 16 checksum
 algorithm](https://en.wikipedia.org/wiki/Fletcher%27s_checksum) into the source

2018/poikola/index.html

@@ -429,7 +429,7 @@ file <em>poikola.pdf</em>.</p>
 this star and may I have some Easter eggs?”</p>
 <p>So I had to sit down and solve those tricky questions with Nano and a C
 compiler.</p>
-<h3 id="little-spoilers">Little spoilers:</h3>
+<h3 id="a-bit-of-deobfuscation">A bit of deobfuscation:</h3>
 <p>Basically, the program draws animated ASCII art of the Big Dipper using Annie
 Jump Cannon’s spectral classification system of stars and I think the colors of
 the output are as accurate as possible.</p>
@@ -467,7 +467,7 @@ show anything at all. In other cases it won’t show all the colours right but
 mostly is okay. YMMV, as they say.</p>
 <h3 id="warnings-and-restrictions-required-by-law">Warnings and restrictions required by law:</h3>
 <p>Please do not feed little babies chocolate.</p>
-<h3 id="major-spoilers">Major spoilers:</h3>
+<h3 id="major-deobfuscation">Major deobfuscation:</h3>
 <p>I incorporated the <a href="https://en.wikipedia.org/wiki/Fletcher%27s_checksum">Fletcher 16 checksum
 algorithm</a> into the source
 for security reasons; it might be challenging to make changes without breaking