remove unused files

edit/tab.css

@@ -1,28 +0,0 @@
-.tab-container {
-  display: flex;
-  flex-direction: column;
-}
-.tab-bar {
-  display: flex;
-  flex-direction: row;
-  border-bottom: 1px solid silver;
-  padding: 5px 5px 0 15px;
-}
-.tab-bar-item {
-  margin: 0 0.3em;
-  padding: 0.3em 0.6em;
-  border: 1px solid silver;
-  border-bottom: none;
-  background: silver;
-  cursor: pointer;
-}
-.tab-bar-item.active {
-  background: white;
-}
-.tab-panel {
-  flex-grow: 1;
-}
-.tab-panel > :not(.active) {
-  display: none;
-}
-

edit/tab.js

@@ -1,19 +0,0 @@
-'use strict';
-
-(() => {
-  for (const container of document.querySelectorAll('.tab-container')) {
-    init(container);
-  }
-
-  function init(container) {
-    const tabButtons = [...container.querySelector('.tab-bar').children];
-    const tabPanels = [...container.querySelector('.tab-panel').children];
-    tabButtons.forEach((button, i) => button.addEventListener('click', () => activate(i)));
-
-    function activate(index) {
-      const toggleActive = (button, i) => button.classList.toggle('active', i === index);
-      tabButtons.forEach(toggleActive);
-      tabPanels.forEach(toggleActive);
-    }
-  }
-})();