[#181] add a note for later refactoring

src/web/HTMLCategory.mjs

@@ -36,6 +36,10 @@ class HTMLCategory {
      * Renders the category and all operations within it in HTML.
      *
      * @returns {string}
+     *
+     * @TODO: it will be better if this, and the other HTMLX.js, toHTML() functions
+     * created HTML elements rather than insert and change stringified html, but that
+     * would be part of a bigger refactoring adventure
      */
     toHtml() {
         const catName = "cat" + this.name.replace(/[\s/\-:_]/g, "");