add notices to those who wish for a greater challenge

We add the following level-3 header to help people identify text
they may wish to skip if they wish for a greater challenge:

```
```

After that notice we add:

```
**If you want a greater challenge, don't read any further**:
just try to understand the program via the source.

If you get stuck, come back and read below for additional hints and information.
```

And sometimes follow with:

```
```

Or sometimes follow with:

```
```

Where the alt code impacts a "greater challenge", we add instead:

```
**If you want a greater challenge, don't read any further**:
just try to understand the program without looking at the Alternate code.

If you get stuck, come back and look at the Alternate code.
```

And where a given command impacts a "greater challenge", we add instead:

```
**If you want a greater challenge, don't read any further**:
just try to understand the program without running the command below.

If you get stuck, come back and run the following command:
```

Perform `make www` to perform the above and test under macOS.

2004/hibachi/index.html

@@ -486,7 +486,7 @@ style</a>.</p></li>
 <li><p><code>HTTP/1.0 200 OK</code> == <code>HTTP/1.1 200 OK CRLF Connection: close</code> ?</p></li>
 <li><p><code>getenv()</code> == <code>putenv()</code> ?</p></li>
 <li><p><code>Hibachi</code> can serve <a href="https://www.ioccc.org">www.ioccc.org</a>.</p></li>
-<li><p>Commented spoiler information available.</p></li>
+<li><p>Commented obfuscation change log information available.</p></li>
 </ul>
 <h3 id="known-issues">Known Issues</h3>
 <ul>
@@ -503,6 +503,12 @@ paragraph 3 sentence 2, and so fails to display responses from
 <li>Best Interpretation of RFC 2616</li>
 <li>Winner of The Far Too Much Free Time Award</li>
 </ul>
+<h3 id="notice-to-those-who-wish-for-a-greater-challenge">NOTICE to those who wish for a greater challenge</h3>
+<p><strong>If you want a greater challenge, don’t read any further</strong>:
+just try to understand the program via the source.</p>
+<p>If you get stuck, come back and read below for additional hints and information.</p>
+<h3 id="obfuscation-change-log">Obfuscation change log</h3>
+<p>For additional hints about how the source was obfuscated, read <a href="src/localhost/CHANGELOG.TXT">src/localhost/CHANGELOG.TXT</a>.</p>
 <!--
 
     Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
@@ -543,7 +549,7 @@ paragraph 3 sentence 2, and so fails to display responses from
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/hibachi/src/localhost/test/perl/yahoo-ticker.pl">src/localhost/test/perl/yahoo-ticker.pl</a> - stock price fetch example in Perl</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/hibachi/src/configure.in">src/configure.in</a> - GNU Autoconf script</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/hibachi/src/hibachi-start.sh.in">src/hibachi-start.sh.in</a> - hibachi-start.sh declarations</li>
-<li><a href="src/localhost/CHANGES-SPOILER.TXT">src/localhost/CHANGES-SPOILER.TXT</a> - spoiler change log</li>
+<li><a href="src/localhost/CHANGELOG.TXT">src/localhost/CHANGELOG.TXT</a> - obfuscation change log</li>
 </ul>
 <h2 id="secondary-files">Secondary files</h2>
 <ul>