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.

2004/sds/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>
@@ -141,15 +142,15 @@ Location: <a href="../../location.html#FI">FI</a> - <em>Republic of Finland </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</code></pre>
+<pre><code>    make</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#2004_sds">2004 sds bugs</a>.</p>
 <h2 id="to-use">To use:</h2>
-<pre class="&lt;!---sh--&gt;"><code>    ./sds</code></pre>
+<pre><code>    ./sds</code></pre>
 <h2 id="try">Try:</h2>
-<pre class="&lt;!---sh--&gt;"><code>    ./try.sh</code></pre>
+<pre><code>    ./try.sh</code></pre>
 <h2 id="judges-remarks">Judges’ remarks:</h2>
 <p>Why not use the program to hide another program in the program? It
 must have seemed reasonable at the time.</p>
@@ -174,19 +175,19 @@ provide a separate encoding program, you should not be surprised to
 learn that I opted to steganographically hide the encoder inside the
 decoder.</p>
 <p>Try it out. Compile the program, then type</p>
-<pre class="&lt;!---sh--&gt;"><code>    ./sds &lt; sds.c</code></pre>
+<pre><code>    ./sds &lt; sds.c</code></pre>
 <p>You should see the encoder program displayed. Now save it, like:</p>
-<pre class="&lt;!---sh--&gt;"><code>    ./sds &lt; sds.c &gt; encoder.c</code></pre>
+<pre><code>    ./sds &lt; sds.c &gt; encoder.c</code></pre>
 <p>Then compile <code>encoder.c</code>. You now have the complete system ready.</p>
 <p>The encoder expects to get a filename as an argument. This filename
 is the name of the file containing the information to be hidden. It
 expects the file in which to hide the information to be on the
 standard input, and will output the results on the standard output.</p>
 <p>You can use it like this (assuming you have a file called remarks):</p>
-<pre class="&lt;!---sh--&gt;"><code>    echo &#39;Hello, World!&#39; &gt; message
+<pre><code>    echo &#39;Hello, World!&#39; &gt; message
     ./encoder message &lt; remarks &gt; remarks_msg</code></pre>
 <p>Then to decode:</p>
-<pre class="&lt;!---sh--&gt;"><code>    ./sds &lt; remarks_msg
+<pre><code>    ./sds &lt; remarks_msg
     Hello, World!</code></pre>
 <p>C programs are mostly unaffected by adding steganographic content,
 but it is possible in certain circumstances for whitespace to be
@@ -233,10 +234,10 @@ GNU C.</p>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/sds/sds.orig.c">sds.orig.c</a> - original source</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/sds/try.sh">try.sh</a> - how to run</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/sds/README_sds.txt">README_sds.txt</a> - sample data used by try.sh</li>
-<li><a href="2004_sds.tar.bz2">2004_sds.tar.bz2</a> - download entry tarball</li>
 </ul>
 <h2 id="secondary-files">Secondary files</h2>
 <ul>
+<li><a href="2004_sds.tar.bz2">2004_sds.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/2004/sds/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/2004/sds/.entry.json">.entry.json</a> - description of entry in JSON</li>