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/meyer/.entry.json

@@ -35,7 +35,7 @@
 	},
 	{
 	    "file_path" : "2006_meyer.tar.bz2",
-	    "inventory_order" : 100000,
+	    "inventory_order" : 1415926535,
 	    "OK_to_edit" : false,
 	    "display_as" : "tbz2",
 	    "display_via_github" : false,

2006/meyer/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>
@@ -141,11 +142,11 @@ 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>    ./meyer [SEED]</code></pre>
+<pre><code>    ./meyer [SEED]</code></pre>
 <h2 id="try">Try:</h2>
-<pre class="&lt;!---sh--&gt;"><code>    ./meyer [SEED]</code></pre>
+<pre><code>    ./meyer [SEED]</code></pre>
 <p>For your first input try:</p>
 <pre><code>    a 0 1</code></pre>
 <p>where <code>a</code> is the row (<code>a</code>-<code>i</code>), <code>0</code> is the column (<code>0</code>-<code>8</code>) and <code>1</code> is the
@@ -183,7 +184,7 @@ it is obvious, that object-oriented code isn’t ‘<code>WYWIWID</code>’ (‘
 you write is what it does’). It may be tempting to think that</p>
 <pre><code>    Object o;</code></pre>
 <p>might do something similar as</p>
-<pre class="&lt;!---c--&gt;"><code>    struct not_an_object o;</code></pre>
+<pre><code>    struct not_an_object o;</code></pre>
 <p>But this program reveals that it doesn’t. Even worse, this program only
 reveals the tip of the iceberg, what kind of black magic is involved in
 a simple declaration of an object.</p>
@@ -201,7 +202,7 @@ and <a href="https://en.wikipedia.org/wiki/Polymorphism_(computer_science)">poly
 <p>It is left as an exercise to the reader to find a corresponding
 implementation in a popular object-oriented programming language.</p>
 <h3 id="starting-the-game">Starting the game</h3>
-<pre class="&lt;!---sh--&gt;"><code>    ./meyer [SEED]</code></pre>
+<pre><code>    ./meyer [SEED]</code></pre>
 <h3 id="gameplay">Gameplay</h3>
 <p>It is a <a href="https://en.wikipedia.org/wiki/Sudoku">sudoku</a> based game. The goal of
 the game is to be able to do the last valid ‘move’.</p>
@@ -246,10 +247,10 @@ breaking the following rule. Any number must be unique in its:</p>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/meyer/meyer.c">meyer.c</a> - entry source</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/meyer/Makefile">Makefile</a> - entry Makefile</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2006/meyer/meyer.orig.c">meyer.orig.c</a> - original source</li>
-<li><a href="2006_meyer.tar.bz2">2006_meyer.tar.bz2</a> - download entry tarball</li>
 </ul>
 <h2 id="secondary-files">Secondary files</h2>
 <ul>
+<li><a href="2006_meyer.tar.bz2">2006_meyer.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/meyer/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/meyer/.entry.json">.entry.json</a> - description of entry in JSON</li>