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.

2006/monge/README.md

@@ -248,6 +248,14 @@ changing the definitions of `W`, `H` and `I` at the beginning of the code.
   parameter.
 
 
+### 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
 
 Sure, I don't want to deprive you of the pleasure of digging

2006/monge/index.html

@@ -553,6 +553,10 @@ numbers.</li>
 <li>There should be some way to switch from Mandelbrot to Julia with chosen
 parameter.</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">Obfuscation</h3>
 <p>Sure, I don’t want to deprive you of the pleasure of digging
 into the infernal mess created by my corrupted mind (writing

2006/toledo2/README.md

@@ -222,7 +222,15 @@ In Unix the min 0 on `stty` is required but circa 2001
 it was not required.
 
 
-### How it works (obfuscation)
+### 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.
+
+
+### How this entry works:
 
 The `l` array contains the 64K memory; it is initialized with a boot image
 loaded from the `C` file. The [program

2006/toledo2/index.html

@@ -534,7 +534,11 @@ is not what is needed.</p>
 <p>On PC/DOS you need to add <code>ANSI.SYS</code> to <code>CONFIG.SYS</code>.</p>
 <p>In Unix the min 0 on <code>stty</code> is required but circa 2001
 it was not required.</p>
-<h3 id="how-it-works-obfuscation">How it works (obfuscation)</h3>
+<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="how-this-entry-works">How this entry works:</h3>
 <p>The <code>l</code> array contains the 64K memory; it is initialized with a boot image
 loaded from the <code>C</code> file. The <a href="https://en.wikipedia.org/wiki/Program_counter">program
 counter</a> is the <code>c</code> pointer and