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.

1995/cdua/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>
@@ -144,7 +145,7 @@ Location: <a href="../../location.html#ZZ">ZZ</a> - <em>Unknown location</em></l
 <p>We recommend that you try the alternate version first so you can see what this
 entry looked like back in 1995 (with a configurable speed). See the <a href="#original-code">original
 code</a> section below for the original entry.</p>
-<pre class="&lt;!---sh--&gt;"><code>    make alt</code></pre>
+<pre><code>    make alt</code></pre>
 <p>The alternate version uses <code>usleep(3)</code> with <code>SLEEP</code> (defined in the Makefile,
 default <code>3000</code>) microseconds to make it easier to see the maze being solved in
 real time. You can redefine <code>SLEEP</code> at compile time to reconfigure it in case
@@ -155,13 +156,13 @@ making it 100000 (which is actually fun :-) ).</p>
 <pre><code>    STATUS: INABIAF - please **DO NOT** fix</code></pre>
 <p>For more detailed information see <a href="../../bugs.html#1995_cdua">1995 cdua bugs</a>.</p>
 <h2 id="to-use">To use:</h2>
-<pre class="&lt;!---sh--&gt;"><code>    ./cdua.alt</code></pre>
+<pre><code>    ./cdua.alt</code></pre>
 <h2 id="try">Try:</h2>
-<pre class="&lt;!---sh--&gt;"><code>    make SLEEP=1500 clobber alt
+<pre><code>    make SLEEP=1500 clobber alt
 
     ./cdua.alt # press enter and watch it go much faster!</code></pre>
 <p>You might also like to try:</p>
-<pre class="&lt;!---sh--&gt;"><code>    make SLEEP=65000 clobber alt
+<pre><code>    make SLEEP=65000 clobber alt
 
     ./cdua.alt # press enter and watch it go much slower!</code></pre>
 <p>Do you see anything strange in this version when <code>SLEEP</code> is a high value like
@@ -174,9 +175,9 @@ actually see it being solved in real time rather than have it go by in a flash.<
 <p>If you wish to use the original version, for instance if you wish to see how
 fast your computer is :-) or use both to see the difference, you can do so.</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>
-<pre class="&lt;!---sh--&gt;"><code>    ./cdua</code></pre>
+<pre><code>    ./cdua</code></pre>
 <h2 id="judges-remarks">Judges’ remarks:</h2>
 <p>This could be used as the basis of an a-maze-ing screen exerciser.</p>
 <h2 id="authors-remarks">Author’s remarks:</h2>
@@ -211,10 +212,10 @@ statement to solve the maze.</p>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1995/cdua/Makefile">Makefile</a> - entry Makefile</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1995/cdua/cdua.alt.c">cdua.alt.c</a> - alternative source</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1995/cdua/cdua.orig.c">cdua.orig.c</a> - original source</li>
-<li><a href="1995_cdua.tar.bz2">1995_cdua.tar.bz2</a> - download entry tarball</li>
 </ul>
 <h2 id="secondary-files">Secondary files</h2>
 <ul>
+<li><a href="1995_cdua.tar.bz2">1995_cdua.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/1995/cdua/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/1995/cdua/.entry.json">.entry.json</a> - description of entry in JSON</li>