removing some unused code

docs/UIUtils.js

@@ -20,61 +20,14 @@ class UIUtils {
         return document.getElementById(templateId).content.firstElementChild.cloneNode(true);
     }
 
-    static createCanvas() {
-        return UIUtils.instantiateTemplate('template-canvas');
-    }
-
     static clear(container) {
         container.replaceChildren();
     }
 
-    static createChartViewElementWithHeading(heading) {
-        const chartViewElement = UIUtils.instantiateTemplate('template-ChartView');
-        chartViewElement.querySelector(".heading").textContent = heading;
-        return {
-            chartViewElement: chartViewElement,
-            canvas: chartViewElement.querySelector(".canvas")
-        };
-    }
-
     static getSelectedOption(selectElement) {
         return selectElement.options[selectElement.selectedIndex];
     }
 
-    static getYLabelWithPercent(context) {
-        return UIUtils.#getLabelWithPercent(context, context.parsed.y);
-    }
-
-    static getXLabelWithPercent(context) {
-        return UIUtils.#getLabelWithPercent(context, context.parsed.x);
-    }
-
-    static #getLabelWithPercent(context, value) {
-        let label = context.dataset.label || '';
-
-        if (label) {
-            label += ': ';
-        }
-        if (value !== null) {
-            label += value.toFixed(1) + "%";
-        }
-        return label;
-    }
-
-    static getPercentageScale(label) {
-        return {
-            min: 0,
-            max: 100,
-            title: {
-                display: true,
-                text: label
-            },
-            ticks: {
-                callback: value => value + "%"
-            }
-        }
-    }
-
     static getSearchParam(urlParams, searchParam, defaultValue) {
         return urlParams.has(searchParam) ?
             urlParams.get(searchParam) :