Rename 2020/ferguson1/deobfuscation -> obfuscation

As the file is not actually code and does not give deobfuscated code but
rather shows how I obfuscated it (indirectly and directly) a better
name, if spoilers will not work, is obfuscation. Thus obfuscation.md and
obfuscation.html are the new names.

Manifest updated; regenerated .entry.json, index.html and other html
files that link to the html file.

In a heading/section (in obfuscation.html) I linked to two files that
are named.

2020/ferguson1/index.html

@@ -507,7 +507,7 @@ This game has a number of configurable pitfalls including walls and snakes.</p>
 </ul>
 <p>Because most of us could use some <em>Double-layered Chocolate Fudge Cake</em>!</p>
 <ul>
-<li><a href="deobfuscation.html">deobfuscation.html</a></li>
+<li><a href="obfuscation.html">obfuscation.html</a></li>
 </ul>
 <p>Read <strong><em>ONLY</em></strong> if you really must give up trying to de-obfuscate!</p>
 <h2 id="authors-remarks">Author’s remarks:</h2>
@@ -559,7 +559,7 @@ first glance but are not) that I have thought of or encountered.</p>
 <p>The <a href="terminals.html">terminals.html</a> has a variety of information
 specific to terminals from input/directions, dimensions, sanity and colours: a
 sort of troubleshooting guide for terminals with some additional information.</p>
-<p>The <a href="deobfuscation.html">deobfuscation.html</a> has a variety of information
+<p>The <a href="obfuscation.html">obfuscation.html</a> has a variety of information
 including some of the obfuscation techniques and a bit of how it works.</p>
 <p>The <a href="bugs.html">bugs.html</a> has a list of known bugs and things that
 look like bugs but aren’t as well as documenting a built-in test unit for some
@@ -912,8 +912,8 @@ email but I’m more likely to respond to mastodon messages.</p>
 <li><a href="cannibalism.log.html">cannibalism.log.html</a> - shows extreme cannibalism mode output</li>
 <li><a href="chocolate-cake.html">chocolate-cake.html</a> - Double-layered Chocolate Fudge Cake Recipe</li>
 <li><a href="crazy.log.html">crazy.log.html</a> - explains various odd screen dumps</li>
-<li><a href="deobfuscation.html">deobfuscation.html</a> - Deobfuscation information about the code</li>
 <li><a href="gameplay.html">gameplay.html</a> - many different gameplay modes described</li>
+<li><a href="obfuscation.html">obfuscation.html</a> - Obfuscation information about the code</li>
 <li><a href="terminals.html">terminals.html</a> - terminal capabilities and dimensions and colours</li>
 <li><a href="troubleshooting.html">troubleshooting.html</a> - troubleshooting Snake</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/ferguson1/prog.2.c">prog.2.c</a> - source code with more digraphs</li>
@@ -933,11 +933,11 @@ email but I’m more likely to respond to mastodon messages.</p>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/ferguson1/cannibalism.log.md">cannibalism.log.md</a> - markdown source for cannibalism.log.html</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/ferguson1/chocolate-cake.md">chocolate-cake.md</a> - markdown source for chocolate-cake.html</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/ferguson1/crazy.log.md">crazy.log.md</a> - markdown source for crazy.log.html</li>
-<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/ferguson1/deobfuscation.md">deobfuscation.md</a> - markdown source for deobfuscation.html</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/ferguson1/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/ferguson1/gameplay.md">gameplay.md</a> - markdown source for gameplay.html</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/ferguson1/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
 <li><a href="ioccc-cake.jpg">ioccc-cake.jpg</a> - image of Double-layered Chocolate Fudge Cake with ‘IOCCC’</li>
+<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/ferguson1/obfuscation.md">obfuscation.md</a> - markdown source for obfuscation.html</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/ferguson1/.path">.path</a> - directory path from top level directory</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/ferguson1/terminals.md">terminals.md</a> - markdown source for terminals.html</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/ferguson1/troubleshooting.md">troubleshooting.md</a> - markdown source for troubleshooting.html</li>