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.

1988/isaak/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>
@@ -141,16 +142,16 @@ 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>
 <p>There is an alternate version, the original, that can’t be compiled in modern
 systems but can be if you have an old enough compiler. See <a href="#alternate-code">Alternate
 code</a> below.</p>
 <h2 id="to-use">To use:</h2>
-<pre class="&lt;!---sh--&gt;"><code>    ./isaak</code></pre>
+<pre><code>    ./isaak</code></pre>
 <h2 id="alternate-code">Alternate code:</h2>
 <p>The original version of this code is in <a href="isaak.alt.c">isaak.alt.c</a>.
 The original entry starts with the line:</p>
-<pre class="&lt;!---c--&gt;"><code>    main(){};</code></pre>
+<pre><code>    main(){};</code></pre>
 <p>This works on some systems. Why? Note that <code>#include &lt;stdio.h&gt;</code> is given on
 the last line. Why is this needed? Note the unusual calls to <code>sprintf(3)</code>.</p>
 <p>This version also relied on being able to define <code>#define</code> to something else and
@@ -158,7 +159,7 @@ using that macro for <code>#define</code>.</p>
 <p>This version will not likely work on modern systems if you can even get it to
 compile.</p>
 <h3 id="alternate-build">Alternate build:</h3>
-<pre class="&lt;!---sh--&gt;"><code>    make alt</code></pre>
+<pre><code>    make alt</code></pre>
 <p>Use <code>isaak.alt</code> as you would <code>isaak</code> above.</p>
 <h2 id="judges-remarks">Judges’ remarks:</h2>
 <p>The program relies heavily on ASCII. Don’t even think of running it on
@@ -173,7 +174,7 @@ from a single macro (e.g., <code>"O/**/O"</code> creates either <code>++</code>
 <p>NOTE: Most System V machines were not be able to execute this program correctly
 due to the fact that BSD style systems have an <code>sprintf(3)</code> that returns a <code>char *</code>. Due to the above problems, we placed the output of this program in the
 file: isaak.encode. To read this file do.</p>
-<pre class="&lt;!---sh--&gt;"><code>    uudecode &lt; isaak.encode
+<pre><code>    uudecode &lt; isaak.encode
     cat isaak.output</code></pre>
 <p>Since this was fixed, this file is not strictly necessary. See the
 <a href="isaak.alt.c">isaak.alt.c</a> for the original source.</p>
@@ -208,10 +209,10 @@ file: isaak.encode. To read this file do.</p>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1988/isaak/isaak.alt.c">isaak.alt.c</a> - alternative source</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1988/isaak/isaak.orig.c">isaak.orig.c</a> - original source</li>
 <li><a href="isaak.encode">isaak.encode</a> - uuencoded sample output</li>
-<li><a href="1988_isaak.tar.bz2">1988_isaak.tar.bz2</a> - download entry tarball</li>
 </ul>
 <h2 id="secondary-files">Secondary files</h2>
 <ul>
+<li><a href="1988_isaak.tar.bz2">1988_isaak.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/1988/isaak/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/1988/isaak/.entry.json">.entry.json</a> - description of entry in JSON</li>