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.

2019/giles/.entry.json

@@ -59,7 +59,7 @@
 	},
 	{
 	    "file_path" : "2019_giles.tar.bz2",
-	    "inventory_order" : 100000,
+	    "inventory_order" : 1415926535,
 	    "OK_to_edit" : false,
 	    "display_as" : "tbz2",
 	    "display_via_github" : false,

2019/giles/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>
@@ -141,11 +142,11 @@ Location: <a href="../../location.html#AU">AU</a> - <em>Commonwealth of Australi
 <!-- 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 infile.wav outfile.wav</code></pre>
+<pre><code>    ./prog infile.wav outfile.wav</code></pre>
 <h2 id="try">Try:</h2>
-<pre class="&lt;!---sh--&gt;"><code>    ./try.sh</code></pre>
+<pre><code>    ./try.sh</code></pre>
 <p>NOTE: <code>play</code>, which <a href="try.sh">try.sh</a> uses, comes from SoX, the Swiss Army Knife
 of sound processing programs. If you don’t have this installed, see <a href="../../faq.html#sox">FAQ 3.10:
 How do I compile and use an IOCCC entry that requires sound</a>.</p>
@@ -175,7 +176,7 @@ the latter reports warnings about loss of information when converting <code>floa
 and that <code>void (*)()</code> and <code>void (*)(void)</code> are not the same thing.</p>
 <p>Interesting fact: The size of the program from <code>./iocccsize -i</code> is 2019.</p>
 <h4 id="how-to-use">How to use:</h4>
-<pre class="&lt;!---sh--&gt;"><code>    ./prog input [output [size [dry [wet [damping]]]]]
+<pre><code>    ./prog input [output [size [dry [wet [damping]]]]]
     prog.exe input [output [size [dry [wet [damping]]]]]</code></pre>
 <ul>
 <li><code>input</code>: The path to the input file. Required.</li>
@@ -196,7 +197,7 @@ decimal numbers (e.g. 0.35) or as percentages (e.g. 35%).</p>
 <p>The default settings are designed to make the effect obvious rather than subtle,
 so it may be a good idea to adjust the ratio of “dry” to “wet”, to give a more
 pleasant result:</p>
-<pre class="&lt;!---sh--&gt;"><code>    ./prog in.wav out.wav 1.8 80% 15%</code></pre>
+<pre><code>    ./prog in.wav out.wav 1.8 80% 15%</code></pre>
 <p>The program only supports WAV files, and only mostly. Other audio formats, such
 as MP3, are not supported because they are difficult to decode, but there are
 free programs such as <code>ffmpeg</code> that can perform the conversion. Some of the
@@ -356,10 +357,10 @@ where the data ends up. For example:</p>
 <li><a href="BlockDiagram.png">BlockDiagram.png</a> - reverb algorithm block-diagram of internal structure</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/giles/try.sh">try.sh</a> - how to run</li>
 <li><a href="MonodyVocals.wav">MonodyVocals.wav</a> - Monody by TheFatRat featuring Laura Brehm</li>
-<li><a href="2019_giles.tar.bz2">2019_giles.tar.bz2</a> - download entry tarball</li>
 </ul>
 <h2 id="secondary-files">Secondary files</h2>
 <ul>
+<li><a href="2019_giles.tar.bz2">2019_giles.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/2019/giles/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/2019/giles/.entry.json">.entry.json</a> - description of entry in JSON</li>