Support additional text on the same lines as section headings.

src/pco_chordspkg/html.nim

@@ -40,6 +40,13 @@ h3 {
   text-decoration: underline;
 }
 
+h3 .section-text {
+  font-style: italic;
+  font-size: 1em;
+  font-weight: normal;
+  margin: 0 0.5em;
+}
+
 .line {
   display: flex;
   flex-direction: row;
@@ -108,7 +115,13 @@ proc toHtml(ctx: var FormatContext, node: ChordChartNode, indent: string): strin
   of ccnkSection:
     ctx.currentSection = node
     result &= indent & "<section>\p" &
-      indent & "  " & "<h3>" & node.sectionName & "</h3>\p"
+      indent & "  " & "<h3>" & node.sectionName
+
+    if ctx.currentSection.remainingSectionLine.isSome:
+      result &= "<span class='section-text'>" &
+        ctx.currentSection.remainingSectionLine.get & "</span>"
+
+    result &= "</h3>\p"
 
     var contents = newSeq[string]()
     for contentNode in node.sectionContents: