feat: More styles, renames some items.

Sources/CliDoc/Modifiers/ShellCommandStyle.swift

@@ -0,0 +1,28 @@
+import Rainbow
+
+public struct ShellCommandConfiguration {
+  let symbol: any TextNode
+  let content: any TextNode
+}
+
+public extension ShellCommand {
+  func style<S: ShellCommandStyle>(_ style: S) -> some TextNode {
+    style.render(content: .init(symbol: symbol, content: content))
+  }
+}
+
+public protocol ShellCommandStyle: NodeModifier where Self.Content == ShellCommandConfiguration {}
+
+public extension ShellCommandStyle where Self == DefaultShellCommandStyle {
+  static var `default`: Self { DefaultShellCommandStyle() }
+}
+
+public struct DefaultShellCommandStyle: ShellCommandStyle {
+
+  public func render(content: ShellCommandConfiguration) -> some TextNode {
+    HStack {
+      content.symbol
+      content.content.textStyle(.italic)
+    }
+  }
+}