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.

1989/jar.1/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>
@@ -142,22 +143,22 @@ Location: <a href="../../location.html#SE">SE</a> - <em>Kingdom of Sweden</em> (
 
 <h2 id="to-build">To build:</h2>
 <p>NOTE: this will run the program itself.</p>
-<pre class="&lt;!---sh--&gt;"><code>    make clobber all</code></pre>
+<pre><code>    make clobber all</code></pre>
 <p>There is an alternate version with a slight difference that you may wish to try.
 See the <a href="#alternate-code">Alternate code</a> section below for more details.</p>
 <h2 id="to-use">To use:</h2>
-<pre class="&lt;!---sh--&gt;"><code>    ./jar.1</code></pre>
+<pre><code>    ./jar.1</code></pre>
 <h2 id="alternate-code">Alternate code:</h2>
 <p>This alternate code, which prints something slightly different, is provided as well.</p>
 <h3 id="alternate-build">Alternate build:</h3>
 <p>NOTE: this will run the program itself.</p>
-<pre class="&lt;!---sh--&gt;"><code>    make clobber alt</code></pre>
+<pre><code>    make clobber alt</code></pre>
 <h3 id="alternate-use">Alternate use:</h3>
-<pre class="&lt;!---sh--&gt;"><code>    ./jar.1.alt</code></pre>
+<pre><code>    ./jar.1.alt</code></pre>
 <h2 id="judges-remarks">Judges’ remarks:</h2>
 <p>On many systems the compiler will not allow you to send the object file to
 <code>/dev/tty</code>. The author suggested:</p>
-<pre class="&lt;!---sh--&gt;"><code>    cc -c -o /dev/tty jar.1.c</code></pre>
+<pre><code>    cc -c -o /dev/tty jar.1.c</code></pre>
 <p>As a last resort the <code>jar.1.sh</code> script provided simulates
 writing the raw binary of the .o file to the terminal.</p>
 <p>Abuse of the rules winning entry usually result in a change of the rules.
@@ -220,10 +221,10 @@ need not be actually run.</p>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1989/jar.1/jar.1.orig.c">jar.1.orig.c</a> - original source</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1989/jar.1/jar.1.alt.sh">jar.1.alt.sh</a> - a method to compile</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1989/jar.1/jar.1.sh">jar.1.sh</a> - a method to compile the alternative source</li>
-<li><a href="1989_jar.1.tar.bz2">1989_jar.1.tar.bz2</a> - download entry tarball</li>
 </ul>
 <h2 id="secondary-files">Secondary files</h2>
 <ul>
+<li><a href="1989_jar.1.tar.bz2">1989_jar.1.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/1989/jar.1/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/1989/jar.1/.entry.json">.entry.json</a> - description of entry in JSON</li>