Add notes list and integrate into templates

New partial templates/notes-list.html to render the notes list.
Add .notes-list CSS for styling and ensure contents areas use it.
Refactor site.hs: add loadNoteLinks and provide a "notes" listField
used by index and note pages.

css/default.css

@@ -264,6 +264,20 @@ ul {
     list-style-type: square;
     padding-left: 2em;
 }
+.notes-list {
+    list-style: none;
+    padding-left: 0;
+    margin-left: 0;
+}
+.notes-list li {
+    position: relative;
+    padding-left: 1em;
+}
+.notes-list li::before {
+    content: "-";
+    position: absolute;
+    left: 0;
+}
 li {
     margin-bottom: 0.15em;
 }
@@ -404,6 +418,12 @@ code {
         margin-left: 0
     }
 
+    div#contents ul.notes-list,
+    div#contents-big ul.notes-list {
+        list-style: none;
+        padding-left: 0;
+    }
+
     div#contents-big ul ul {
         list-style-type: none;
     }