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.

2005/anon/README.md

@@ -281,6 +281,14 @@ It probably will also compile and work on many (all?) other \*nix platforms as
 well. How does it achieve this incredible feat?
 
 
+### NOTICE to those who wish for a greater challenge
+
+**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.
+
+
 ### OBFUSCATION
 
 Read the following only if you give up figuring it out :-)

2005/anon/index.html

@@ -578,6 +578,10 @@ on the following architectures:</p>
 </ul>
 <p>It probably will also compile and work on many (all?) other *nix platforms as
 well. How does it achieve this incredible feat?</p>
+<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">OBFUSCATION</h3>
 <p>Read the following only if you give up figuring it out :-)</p>
 <h4 id="the-evil-hack">The Evil Hack</h4>