Add layout and dice roll to guide

SVGs from <https://github.com/perthmahjongsoc/mahjong-wall-svg/releases/tag/v1.0.1>.

guide/index.cmd

@@ -3,7 +3,7 @@
 OrdinaryDictionaryReplacement: #.boilerplate-properties-override
 - queue_position: BEFORE #boilerplate-properties
 * %title --> Guide
-* %date-modified --> 2023-11-22
+* %date-modified --> 2023-11-25
 
 %%%
 
@@ -21,6 +21,8 @@ The game should be played according to player consensus.
 Quick links:
 --
 ====
+- [Layout & dice roll]
+
 - [Tiles]
   ==
   - [Numbered suits]
@@ -40,6 +42,26 @@ Quick links:
 ====
 
 
+##{#layout} Layout & dice roll
+
+--
+The following diagrams show a top-down view of the initial four-wall layout.
+The numbered markers indicate (for each dice roll total)
+the initial position for drawing tiles.
+--
+===={.spacious}
+- 18-column walls:
+  ||
+    ![Diagram of layout.](/res/mahjong-wall-18-columns-with-start.svg)
+  ||
+
+- 17-column walls (no flowers):
+  ||
+    ![Diagram of layout.](/res/mahjong-wall-17-columns-with-start.svg)
+  ||
+====
+
+
 ##{#tiles} Tiles
 
 --
@@ -423,6 +445,7 @@ in particular the [Details section].
 --
 
 
+[Layout & dice roll]: #layout
 [Tiles]: #tiles
   [Numbered suits]: #numbered-suits
   [Unnumbered suits]: #unnumbered-suits

guide/index.html

@@ -45,6 +45,9 @@ <h1>Guide</h1>
 </p>
 <ul>
 <li>
+<a href="#layout">Layout &amp; dice roll</a>
+</li>
+<li>
 <a href="#tiles">Tiles</a>
 <ul>
 <li>
@@ -76,6 +79,26 @@ <h1>Guide</h1>
 <a href="#scoring">Scoring</a>
 </li>
 </ul>
+<h2 id="layout"><a href="#layout" class="permalink" aria-label="Permalink"></a>Layout &amp; dice roll</h2>
+<p>
+The following diagrams show a top-down view of the initial four-wall layout.
+The numbered markers indicate (for each dice roll total)
+the initial position for drawing tiles.
+</p>
+<ul class="spacious">
+<li>
+18-column walls:
+<div>
+<img alt="Diagram of layout." src="/res/mahjong-wall-18-columns-with-start.svg">
+</div>
+</li>
+<li>
+17-column walls (no flowers):
+<div>
+<img alt="Diagram of layout." src="/res/mahjong-wall-17-columns-with-start.svg">
+</div>
+</li>
+</ul>
 <h2 id="tiles"><a href="#tiles" class="permalink" aria-label="Permalink"></a>Tiles</h2>
 <p>
 The tile icons used in this guide are licensed under <a href="https://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>,
@@ -525,7 +548,7 @@ <h2 id="scoring"><a href="#scoring" class="permalink" aria-label="Permalink"></a
 </p>
 <footer>
 Source: <a href="https://github.com/perthmahjongsoc/perthmahjongsoc.github.io/blob/master/guide/index.cmd"><code>guide/index.cmd</code></a>.
-Last modified: <time datetime="2023-11-22">2023-11-22</time>.
+Last modified: <time datetime="2023-11-25">2023-11-25</time>.
 </footer>
 </body>
 </html>