add rules, guidelines, fix HTML code, move compressed tarball in inventory

By changing the _inventory_order_ of the compressed tarball from
**100000** to **1415926535**, the compressed tarball will land at
the top of the secondary file list and remain still easy to find.

Updated the `manifest.numbers` spreadsheet and rebuilt
the `.entry.json` files.

Added `next/` directory to hold the next IOCCC rules and guidelines.
Added `next/README.md` that `bin/gen-top-html.sh` uses to form
the `next/index.html` file.

Added _Rules and Guidelines_ link to the sidenav bar to link to the
`next/index.html` file.

Added _IOCCC Rules_ as `next/rules.md` that `bin/gen-top-html.sh`
uses to form the `next/rules.html` file.

Added _IOCCC Guidelines_ as `next/guidelines.md` that `bin/gen-top-html.sh`
uses to form the `next/guidelines.html` file.

Changed `bin/gen-top-html.sh` VERSION from "1.2.4 2024-04-13"
to "1.3 2024-04-14".

Prevent `pandoc(1)` from interpreting the commented out language
of a markdown code block as a code class.  So a markdown such as:

````
``` <!---sh-->
...
```
````

that produced HTML of the form:

```html
<pre class="&lt;!---sh--&gt;"><code>...</code></pre>
```

will now produce HTML of the form:

```html
<pre><code>...</code></pre>
```

NOTE: Before when the language of a markdown code block
was not commented, the HTML produced by `pandoc(1)` was
oddly indented with extra whitespace on the first line
of the code block.  While commenting out the language
of the code block removed some of the odd intending,
it left a weird class in the HTML pre block that
surrounded the HTML code block.  This hack prevents
`pandoc(1)` from assigning a class to the HTML pre block.

Changed `in/md2html.sh` VERSION from "1.2.1 2024-04-13"
to "1.3 2024-04-14".

Added `make gen_sitemap` to end of both `make www` and `make
quick_www` in top level Makefile.

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

**IMPORTANT NOTE**: The current `next/rules.md` and `next/guidelines.md`
are simply the 2020 IOCCC Rules and Guidelines converted into
markdown form.  There are **NOT** the Rules and Guidelines that
will be used the IOCCC MOCK, nor the next IOCCC.

TODO: Improve the `bin/gen-status.sh` tool to modify the top of the
      `next/rules.md` and `next/guidelines.md` files to keep them
      in sync with the _contest_status_ as found in `status.json`.

TODO: Improve the look and feel of the `next/rules.md` and
      `next/guidelines.md` markdown files.

2006/stewart/.entry.json

@@ -363,7 +363,7 @@
 	},
 	{
 	    "file_path" : "2006_stewart.tar.bz2",
-	    "inventory_order" : 100000,
+	    "inventory_order" : 1415926535,
 	    "OK_to_edit" : false,
 	    "display_as" : "tbz2",
 	    "display_via_github" : false,

2006/stewart/index.html

@@ -88,6 +88,7 @@
     <div class="sidenav">
       <a href="../../news.html">IOCCC News</a>
       <a href="../../status.html">Contest status</a>
+      <a href="../../next/index.html">Rules and Guidelines</a>
       <a href="../../faq.html#submit">How to enter the IOCCC</a>
       <a href="../../faq.html">FAQ</a>
     </div>
@@ -141,9 +142,9 @@ Location: <a href="../../location.html#US">US</a> - <em>United States of America
 <!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
 
 <h2 id="to-build">To build:</h2>
-<pre class="&lt;!---sh--&gt;"><code>    make</code></pre>
+<pre><code>    make</code></pre>
 <h2 id="to-use">To use:</h2>
-<pre class="&lt;!---sh--&gt;"><code>    ./stewart width_and_height iterations file &gt; file.xbm
+<pre><code>    ./stewart width_and_height iterations file &gt; file.xbm
     convert file.xbm file.png</code></pre>
 <p>where <code>file</code> is one of:</p>
 <pre><code>    altar box box2 box3 build carpet circles cross cross2 cross3
@@ -154,7 +155,7 @@ Location: <a href="../../location.html#US">US</a> - <em>United States of America
 <p>NOTE: you cannot specify a different width from height; it’s one number.</p>
 <p>NOTE: <code>convert(1)</code> belongs to <a href="https://imagemagick.org/index.php">ImageMagick</a>.</p>
 <h2 id="try">Try:</h2>
-<pre class="&lt;!---sh--&gt;"><code>    ./try.sh</code></pre>
+<pre><code>    ./try.sh</code></pre>
 <p>After running the program on a few files it will ask you if you wish to run it
 on the remaining files.</p>
 <p>The script will try converting the xbm files created by the program to png
@@ -171,7 +172,7 @@ a reasonably experienced user who can parse formats in their mind. :-)</p>
 <h2 id="authors-remarks">Author’s remarks:</h2>
 <h3 id="execution">Execution</h3>
 <p>The program should be run with the following</p>
-<pre class="&lt;!---sh--&gt;"><code>    ./stewart &lt;m&gt; &lt;n&gt; &lt;ifs&gt;</code></pre>
+<pre><code>    ./stewart &lt;m&gt; &lt;n&gt; &lt;ifs&gt;</code></pre>
 <p>where:</p>
 <pre><code>    m   = The size of the picture (picture will be m X m in size).
     n   = The number of iterations to run (More will make for a
@@ -181,7 +182,7 @@ a reasonably experienced user who can parse formats in their mind. :-)</p>
 on standard out. Minimal checking is done on the arguments mainly that there
 are 3. Wrong arguments will cause the program to bomb out.</p>
 <h4 id="example">Example:</h4>
-<pre class="&lt;!---sh--&gt;"><code>    ./stewart 1024 1000000 gasket &gt; gasket.xbm</code></pre>
+<pre><code>    ./stewart 1024 1000000 gasket &gt; gasket.xbm</code></pre>
 <h3 id="compilationtesting">Compilation/Testing</h3>
 <p>The program compiles without warning with <code>gcc -ansi -Wall</code>.
 <code>lint</code> also seems to like the code. This must be a bug in <code>lint</code>.</p>
@@ -330,10 +331,10 @@ choice from a file size standpoint. 1024x1024 image is 641k in size.</p>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/stewart/tree4">tree4</a> - sample input</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/stewart/tree">tree</a> - sample input</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/stewart/triangle">triangle</a> - sample input</li>
-<li><a href="2006_stewart.tar.bz2">2006_stewart.tar.bz2</a> - download entry tarball</li>
 </ul>
 <h2 id="secondary-files">Secondary files</h2>
 <ul>
+<li><a href="2006_stewart.tar.bz2">2006_stewart.tar.bz2</a> - download entry tarball</li>
 <li><a href="index.html">index.html</a> - this web page</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/stewart/README.md">README.md</a> - markdown source for this web page</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/stewart/.entry.json">.entry.json</a> - description of entry in JSON</li>