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.

1993/vanb/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>
@@ -141,17 +142,17 @@ Location: <a href="../../location.html#ZZ">ZZ</a> - <em>Unknown location</em></l
 <!-- 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 all</code></pre>
+<pre><code>    make all</code></pre>
 <h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
 <p>The current status of this entry is:</p>
 <pre><code>    STATUS: INABIAF - please **DO NOT** fix</code></pre>
 <p>For more detailed information see <a href="../../bugs.html#1993_vanb">1993 vanb bugs</a>.</p>
 <h2 id="to-use">To use:</h2>
-<pre class="&lt;!---sh--&gt;"><code>    ./vanb &#39;exp&#39;</code></pre>
+<pre><code>    ./vanb &#39;exp&#39;</code></pre>
 <p>where <code>exp</code> is an octal expression. See below for how it can also have
 hexadecimal and decimal numbers.</p>
 <h2 id="try">Try:</h2>
-<pre class="&lt;!---sh--&gt;"><code>    ./try.sh</code></pre>
+<pre><code>    ./try.sh</code></pre>
 <p>What happens if you use something other than valid digits?</p>
 <h2 id="judges-remarks">Judges’ remarks:</h2>
 <p>The octal expression may contain:</p>
@@ -217,7 +218,7 @@ involving <code>**O7</code> and octal constants are looking for certain characte
 <p>Here’s a version of the program before it got formatted into the VIII,
 augmented with comments showing where each state begins. <code>N1</code> and <code>N2</code> are
 notes:</p>
-<pre class="&lt;!---c--&gt;"><code>    #define O5 main
+<pre><code>    #define O5 main
     O5(O2,O7,O3)char**O7;
     {
              return
@@ -258,9 +259,9 @@ program with no parameters, in which case it just returns 0.</p>
 the first state it will go into. This state just invokes
 printf, and sends the parser to state <code>012</code> (which is <code>&lt;E&gt;</code>).</p>
 <p>The <code>E</code> and <code>T</code> states work like this:</p>
-<pre class="&lt;!---c--&gt;"><code>    int e(){ return eprime( t() ); }</code></pre>
+<pre><code>    int e(){ return eprime( t() ); }</code></pre>
 <p>The <code>E'</code> and <code>T'</code> states work like this:</p>
-<pre class="&lt;!---c--&gt;"><code>    int eprime( int intermediate )
+<pre><code>    int eprime( int intermediate )
     {
         if( ch == &#39;+&#39; )
         {
@@ -271,7 +272,7 @@ printf, and sends the parser to state <code>012</code> (which is <code>&lt;E&gt;
     }</code></pre>
 <p>The <code>D</code>, <code>X</code> and <code>O</code> states work like this (they assume that they’re initially
 called with <code>0</code>):</p>
-<pre class="&lt;!---c--&gt;"><code>    int octal( int intermediate )
+<pre><code>    int octal( int intermediate )
     {
         if( ch&gt;=&#39;0&#39; &amp;&amp; ch&lt;=&#39;7&#39; )
         {
@@ -310,10 +311,10 @@ called with <code>0</code>):</p>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/vanb.alt.c">vanb.alt.c</a> - alternative source</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/vanb.orig.c">vanb.orig.c</a> - original source</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/vanb/try.sh">try.sh</a> - how to run</li>
-<li><a href="1993_vanb.tar.bz2">1993_vanb.tar.bz2</a> - download entry tarball</li>
 </ul>
 <h2 id="secondary-files">Secondary files</h2>
 <ul>
+<li><a href="1993_vanb.tar.bz2">1993_vanb.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/1993/vanb/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/1993/vanb/.entry.json">.entry.json</a> - description of entry in JSON</li>