Add another example theme

source/assets/sass/sass.scss

@@ -38,4 +38,7 @@
 @use 'regions/banner';
 
 // @@@ Do we want this theme?
-@use 'prismjs/themes/prism.css';
+// @use 'prismjs/themes/prism.css';
+
+// @@@ Or this one? Or neither?
+@use 'vendor/prism-ghcolors';

source/assets/sass/vendor/_prism-ghcolors.css

@@ -0,0 +1,122 @@
+/**
+ * GHColors theme by Avi Aryan (http://aviaryan.in)
+ * Inspired by Github syntax coloring
+ */
+
+code[class*="language-"],
+pre[class*="language-"] {
+	color: #393A34;
+	font-family: "Consolas", "Bitstream Vera Sans Mono", "Courier New", Courier, monospace;
+	direction: ltr;
+	text-align: left;
+	white-space: pre;
+	word-spacing: normal;
+	word-break: normal;
+	font-size: .9em;
+	line-height: 1.2em;
+
+	-moz-tab-size: 4;
+	-o-tab-size: 4;
+	tab-size: 4;
+
+	-webkit-hyphens: none;
+	-moz-hyphens: none;
+	-ms-hyphens: none;
+	hyphens: none;
+}
+
+pre > code[class*="language-"] {
+	font-size: 1em;
+}
+
+pre[class*="language-"]::-moz-selection, pre[class*="language-"] ::-moz-selection,
+code[class*="language-"]::-moz-selection, code[class*="language-"] ::-moz-selection {
+	background: #b3d4fc;
+}
+
+pre[class*="language-"]::selection, pre[class*="language-"] ::selection,
+code[class*="language-"]::selection, code[class*="language-"] ::selection {
+	background: #b3d4fc;
+}
+
+/* Code blocks */
+pre[class*="language-"] {
+	padding: 1em;
+	margin: .5em 0;
+	overflow: auto;
+	border: 1px solid #dddddd;
+	background-color: white;
+}
+
+/* Inline code */
+:not(pre) > code[class*="language-"] {
+	padding: .2em;
+	padding-top: 1px;
+	padding-bottom: 1px;
+	background: #f8f8f8;
+	border: 1px solid #dddddd;
+}
+
+.token.comment,
+.token.prolog,
+.token.doctype,
+.token.cdata {
+	color: #999988;
+	font-style: italic;
+}
+
+.token.namespace {
+	opacity: .7;
+}
+
+.token.string,
+.token.attr-value {
+	color: #e3116c;
+}
+
+.token.punctuation,
+.token.operator {
+	color: #393A34; /* no highlight */
+}
+
+.token.entity,
+.token.url,
+.token.symbol,
+.token.number,
+.token.boolean,
+.token.variable,
+.token.constant,
+.token.property,
+.token.regex,
+.token.inserted {
+	color: #36acaa;
+}
+
+.token.atrule,
+.token.keyword,
+.token.attr-name,
+.language-autohotkey .token.selector {
+	color: #00a4db;
+}
+
+.token.function,
+.token.deleted,
+.language-autohotkey .token.tag {
+	color: #9a050f;
+}
+
+.token.tag,
+.token.selector,
+.language-autohotkey .token.keyword {
+	color: #00009f;
+}
+
+.token.important,
+.token.function,
+.token.bold {
+	font-weight: bold;
+}
+
+.token.italic {
+	font-style: italic;
+}

source/install.md

@@ -53,7 +53,7 @@ When you install Sass on the command line, you'll be able to run the
 `sass` executable to compile `.sass` and `.scss` files to `.css` files.
 For example:
 
-```sh
+```plaintext
 sass source/stylesheets/index.scss build/stylesheets/index.css
 ```
 
@@ -80,7 +80,7 @@ Install Anywhere (npm)
 : If you use Node.js, you can also install Sass using
 [npm](https://www.npmjs.com/) by running
 
-    ```sh
+    ```plaintext
     npm install -g sass
     ```
 
@@ -94,7 +94,7 @@ Install on Windows (Chocolatey)
 : If you use the [Chocolatey package manager](https://chocolatey.org/) for
 Windows, you can install Dart Sass by running
 
-    ```sh
+    ```plaintext
     choco install sass
     ```
 
@@ -103,7 +103,7 @@ Install on Mac OS X or Linux (Homebrew)
 : If you use [the Homebrew package manager](https://brew.sh/) for Mac OS X or
 Linux, you can install Dart Sass by running
 
-    ```sh
+    ```plaintext
     brew install sass/sass/sass
     ```