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/cmills/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>
@@ -144,19 +145,19 @@ Location: <a href="../../location.html#US">US</a> - <em>United States of America
 <p>We recommend you try the alt version first so you can get a better idea of what
 this entry was like back in 1993. See the <a href="#original-code">original code</a>
 section below to run the original.</p>
-<pre class="&lt;!---sh--&gt;"><code>    make alt</code></pre>
+<pre><code>    make alt</code></pre>
 <p>NOTE: this entry requires the <code>X11/Xlib.h</code> header file and the X11 library to
 compile. If you’re under macOS and do not know how to install and use X11
 programs see <a href="../../faq.html#X11macos">FAQ 3.7 - How do I compile and use on macOS, an IOCCC entry that
 requires X11?</a>.</p>
 <p>To configure how many microseconds to sleep before updates try:</p>
-<pre class="&lt;!---sh--&gt;"><code>    make clobber SLEEP=200 alt</code></pre>
+<pre><code>    make clobber SLEEP=200 alt</code></pre>
 <h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
 <p>The current status of this entry is:</p>
 <pre><code>    STATUS: known bug - please help us fix</code></pre>
 <p>For more detailed information see <a href="../../bugs.html#1993_cmills">1993 cmills bugs</a>.</p>
 <h2 id="to-use">To use:</h2>
-<pre class="&lt;!---sh--&gt;"><code>    DISPLAY=&quot;your_X_server_display&quot;
+<pre><code>    DISPLAY=&quot;your_X_server_display&quot;
     export DISPLAY
     ./cmills.alt [speed]        # must be run on an X11 server</code></pre>
 <p>where:</p>
@@ -166,7 +167,7 @@ requires X11?</a>.</p>
 <p>We recommend the version that uses <code>usleep(3)</code> to more easily see what is going
 on but you can use the original without any delays if you wish.</p>
 <h3 id="original-build">Original build:</h3>
-<pre class="&lt;!---sh--&gt;"><code>    make all</code></pre>
+<pre><code>    make all</code></pre>
 <h3 id="original-use">Original use:</h3>
 <p>Use <code>cmills</code> as you would <code>cmills.alt</code> above.</p>
 <h2 id="judges-remarks">Judges’ remarks:</h2>
@@ -227,10 +228,10 @@ which in turn is based on it’s area and speed. How silly!</p>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/cmills/Makefile">Makefile</a> - entry Makefile</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/cmills/cmills.alt.c">cmills.alt.c</a> - alternative source</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1993/cmills/cmills.orig.c">cmills.orig.c</a> - original source</li>
-<li><a href="1993_cmills.tar.bz2">1993_cmills.tar.bz2</a> - download entry tarball</li>
 </ul>
 <h2 id="secondary-files">Secondary files</h2>
 <ul>
+<li><a href="1993_cmills.tar.bz2">1993_cmills.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/cmills/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/cmills/.entry.json">.entry.json</a> - description of entry in JSON</li>