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.

1996/jonth/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>
@@ -141,7 +142,7 @@ Location: <a href="../../location.html#NO">NO</a> - <em>Kingdom of Norway</em> (
 <!-- 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>
 <p>NOTE: this entry requires <code>X11/Xlib.h</code> header file and the X11 library to
 compile. macOS users running Mountain Lion and later will need to download and
 install <a href="https://www.xquartz.org">XQuartz</a> in order to compile and run this
@@ -152,17 +153,17 @@ entry.</p>
     STATUS: missing or dead link - please provide them</code></pre>
 <p>For more detailed information see <a href="../../bugs.html#1996_jonth">1996 jonth bugs</a>.</p>
 <h2 id="to-use">To use:</h2>
-<pre class="&lt;!---sh--&gt;"><code>    ./jonth :0 :0</code></pre>
+<pre><code>    ./jonth :0 :0</code></pre>
 <p>NOTE: the two boards will be on top of each other so you will have to drag one
 off the other so that you can properly play.</p>
 <p>NOTE: if there is no X service open this will crash. If this is the case you
 might try:</p>
-<pre class="&lt;!---sh--&gt;"><code>    ./jonth</code></pre>
+<pre><code>    ./jonth</code></pre>
 <p>These are supposed to happen. As is written in the
 <a href="http://catb.org/jargon/html/F/feature.html">The Jargon File</a>:</p>
 <pre><code>    That&#39;s not a bug, that&#39;s a feature.</code></pre>
 <h2 id="try">Try:</h2>
-<pre class="&lt;!---sh--&gt;"><code>    ./jonth host1:0 host2:0</code></pre>
+<pre><code>    ./jonth host1:0 host2:0</code></pre>
 <h2 id="judges-remarks">Judges’ remarks:</h2>
 <p>For extra credit, figure out how you can cheat by taking over a square already
 occupied by an opponent.</p>
@@ -201,10 +202,10 @@ give two display arguments (<code>./jonth host:0 host:0</code>).</p>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1996/jonth/jonth.c">jonth.c</a> - entry source</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1996/jonth/Makefile">Makefile</a> - entry Makefile</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1996/jonth/jonth.orig.c">jonth.orig.c</a> - original source</li>
-<li><a href="1996_jonth.tar.bz2">1996_jonth.tar.bz2</a> - download entry tarball</li>
 </ul>
 <h2 id="secondary-files">Secondary files</h2>
 <ul>
+<li><a href="1996_jonth.tar.bz2">1996_jonth.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/1996/jonth/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/1996/jonth/.entry.json">.entry.json</a> - description of entry in JSON</li>