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.

2020/kurdyukov4/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>
@@ -141,13 +142,13 @@ Location: <a href="../../location.html#RU">RU</a> - <em>Russian Federation</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>
 <h2 id="to-use">To use:</h2>
-<pre class="&lt;!---sh--&gt;"><code>    ./prog text_file output_length context_length random_seed</code></pre>
+<pre><code>    ./prog text_file output_length context_length random_seed</code></pre>
 <h2 id="try">Try:</h2>
 <p>When running this, ask yourself why it gets progressively slower when the
 context length decreases:</p>
-<pre class="&lt;!---sh--&gt;"><code>    ./try.sh</code></pre>
+<pre><code>    ./try.sh</code></pre>
 <blockquote>
 <p>Performance depends on the number of same hashes found.
 Too many identical strings if the context length is small.
@@ -183,11 +184,11 @@ Middle-earth (HoMe)</a>.
 Now can you appreciate the award title a bit better?</p>
 <h2 id="authors-remarks">Author’s remarks:</h2>
 <h3 id="building">Building:</h3>
-<pre class="&lt;!---sh--&gt;"><code>    cc prog.c -o prog</code></pre>
+<pre><code>    cc prog.c -o prog</code></pre>
 <h3 id="usage">Usage:</h3>
 <p>This program generates random text from the provided dictionary using a Markov
 chain, outputting to <code>stdout</code>.</p>
-<pre class="&lt;!---sh--&gt;"><code>    ./prog input.txt 2000 10 12345</code></pre>
+<pre><code>    ./prog input.txt 2000 10 12345</code></pre>
 <p>Parameters are:</p>
 <ol type="1">
 <li><p>dictionary filename
@@ -209,7 +210,7 @@ the output of this size in bytes exists somewhere in the dictionary.</p></li>
 <h3 id="example">Example</h3>
 <p>You can try this with the inputs provided with
 <a href="../../2019/mills/index.html">2019/mills</a> from the IOCCC entries.</p>
-<pre class="&lt;!---sh--&gt;"><code>    $ ./prog Shakespeare.txt 2001 10 12345</code></pre>
+<pre><code>    $ ./prog Shakespeare.txt 2001 10 12345</code></pre>
 <p>produces:</p>
 <pre><code>    r sons, wives for them, as the hope I had it. This is the way they be not too ra
     sh a trial of you only. Therefore will not out of door? Nurse: Marry, bachelor,
@@ -266,10 +267,10 @@ the output of this size in bytes exists somewhere in the dictionary.</p></li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov4/Shakespeare.txt">Shakespeare.txt</a> - Shakespeare text</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov4/rand.c">rand.c</a> - randomize a file</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov4/try.sh">try.sh</a> - how to run</li>
-<li><a href="2020_kurdyukov4.tar.bz2">2020_kurdyukov4.tar.bz2</a> - download entry tarball</li>
 </ul>
 <h2 id="secondary-files">Secondary files</h2>
 <ul>
+<li><a href="2020_kurdyukov4.tar.bz2">2020_kurdyukov4.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/2020/kurdyukov4/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/2020/kurdyukov4/.entry.json">.entry.json</a> - description of entry in JSON</li>