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.

2013/cable1/.entry.json

@@ -51,7 +51,7 @@
 	},
 	{
 	    "file_path" : "2013_cable1.tar.bz2",
-	    "inventory_order" : 100000,
+	    "inventory_order" : 1415926535,
 	    "OK_to_edit" : false,
 	    "display_as" : "tbz2",
 	    "display_via_github" : false,

2013/cable1/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>
@@ -141,28 +142,28 @@ Location: <a href="../../location.html#US">US</a> - <em>United States of America
 <!-- 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>    ./cable1 name group1 group2</code></pre>
+<pre><code>    ./cable1 name group1 group2</code></pre>
 <h2 id="try">Try:</h2>
-<pre class="&lt;!---sh--&gt;"><code>    ./try.sh</code></pre>
+<pre><code>    ./try.sh</code></pre>
 <h2 id="judges-remarks">Judges’ remarks:</h2>
 <p>Partisan may be defined as a strong supporter of a cause, party or person.
 We need not limit ourselves to the two major political parties in the US today.</p>
 <p>Let us consider:</p>
-<pre class="&lt;!---sh--&gt;"><code>    ./cable1 Cooper Mac PC</code></pre>
+<pre><code>    ./cable1 Cooper Mac PC</code></pre>
 <p>Simon works for Apple, so you would expect Mac. :-)
 Landon is a long time Mac user:</p>
-<pre class="&lt;!---sh--&gt;"><code>    ./cable1 Noll Mac PC</code></pre>
+<pre><code>    ./cable1 Noll Mac PC</code></pre>
 <p>That works too! Now Leo brings PCs to the IOCCC judging for cross-platform
 testing:</p>
-<pre class="&lt;!---sh--&gt;"><code>    ./cable1 Broukhis Mac PC</code></pre>
+<pre><code>    ./cable1 Broukhis Mac PC</code></pre>
 <p>We can test other people. The late Steve Jobs:</p>
-<pre class="&lt;!---sh--&gt;"><code>    ./cable1 Jobs Mac PC</code></pre>
+<pre><code>    ./cable1 Jobs Mac PC</code></pre>
 <p>That works! How about Bill?</p>
-<pre class="&lt;!---sh--&gt;"><code>    ./cable1 Gates Mac PC</code></pre>
+<pre><code>    ./cable1 Gates Mac PC</code></pre>
 <p>A PC guy as expected. What about that other Steve?</p>
-<pre class="&lt;!---sh--&gt;"><code>    ./cable1 Ballmer Mac PC</code></pre>
+<pre><code>    ./cable1 Ballmer Mac PC</code></pre>
 <p>Humm .. maybe there is a hidden reason he is leaving the late Micro$oft? :-)
 Why late? Because:</p>
 <figure>
@@ -231,10 +232,10 @@ function declarations are invalid in C99 (but still accepts them).</p>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2013/cable1/cable1.orig.c">cable1.orig.c</a> - original source</li>
 <li><a href="dead-ms-tweet.jpg">dead-ms-tweet.jpg</a> - tweet image</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2013/cable1/try.sh">try.sh</a> - how to run</li>
-<li><a href="2013_cable1.tar.bz2">2013_cable1.tar.bz2</a> - download entry tarball</li>
 </ul>
 <h2 id="secondary-files">Secondary files</h2>
 <ul>
+<li><a href="2013_cable1.tar.bz2">2013_cable1.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/2013/cable1/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/2013/cable1/.entry.json">.entry.json</a> - description of entry in JSON</li>