add RST highlighting for command line / shells (also fixes #16858) (#17789)

doc/nimdoc.css

@@ -35,6 +35,8 @@ Modified by Boyd Greenfield and narimiran
   --escapeSequence: #c4891b;
   --number: #252dbe;
   --literal: #a4255b;
+  --program: #6060c0;
+  --option: #508000;
   --raw-data: #a4255b;
 }
 
@@ -63,6 +65,8 @@ Modified by Boyd Greenfield and narimiran
   --escapeSequence: #bd93f9;
   --number: #bd93f9;
   --literal: #f1fa8c;
+  --program: #9090c0;
+  --option: #90b010;
   --raw-data: #8be9fd;
 }
 
@@ -527,7 +531,6 @@ div.option-list-label {
   margin-left: -11.5em;
   margin-right: 0em;
   min-width: 11.5em;
-  font-weight: bolder;
   display: inline-block;
   vertical-align: top;
 }
@@ -546,7 +549,7 @@ blockquote {
   border-left: 5px solid #bbc;
 }
 
-.pre {
+.pre, span.tok {
   font-family: "Source Code Pro", Monaco, Menlo, Consolas, "Courier New", monospace;
   font-weight: 500;
   font-size: 0.85em;
@@ -557,6 +560,12 @@ blockquote {
   border-radius: 4px;
 }
 
+span.tok {
+  border: 1px solid #808080;
+  padding-bottom: 0.1em;
+  margin-right: 0.2em;
+}
+
 pre {
   font-family: "Source Code Pro", Monaco, Menlo, Consolas, "Courier New", monospace;
   color: var(--text);
@@ -844,9 +853,6 @@ span.classifier {
 span.classifier-delimiter {
   font-weight: bold; }
 
-span.option {
-  white-space: nowrap; }
-
 span.problematic {
   color: #b30000; }
 
@@ -926,6 +932,21 @@ span.Preprocessor {
 span.Directive {
   color: #252dbe; }
 
+span.option {
+  font-weight: bold;
+  font-family: "Source Code Pro", Monaco, Menlo, Consolas, "Courier New", monospace;
+  color: var(--option);
+}
+
+span.program {
+  font-weight: bold;
+  color: var(--program);
+  text-decoration: underline;
+  text-decoration-color: var(--hint);
+  text-decoration-thickness: 0.05em;
+  text-underline-offset: 0.15em;
+}
+
 span.Command, span.Rule, span.Hyperlink, span.Label, span.Reference,
 span.Other {
   color: var(--other); }