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/.entry.json

@@ -130,12 +130,12 @@
 	    "entry_text" : "hibachi-start.sh declarations"
 	},
 	{
-	    "file_path" : "src/localhost/CHANGES-SPOILER.TXT",
+	    "file_path" : "src/localhost/CHANGELOG.TXT",
 	    "inventory_order" : 200,
 	    "OK_to_edit" : true,
 	    "display_as" : "text",
 	    "display_via_github" : false,
-	    "entry_text" : "spoiler change log"
+	    "entry_text" : "obfuscation change log"
 	},
 	{
 	    "file_path" : "2004_hibachi.tar.bz2",