テーマエディターの実装 (#6482)

* テーマ機能の実装

* resolve #6478

* 定数を削除できるように

* 変更を破棄するか確認ダイアログを表示するように

* fix code

* Update theme.ts

* ✌️

* fix path

* wip

* wip

* wip

Co-authored-by: syuilo <syuilotan@yahoo.co.jp>

src/client/router.ts

@@ -24,6 +24,7 @@ export const router = new VueRouter({
 		{ path: '/about-misskey', component: page('about-misskey') },
 		{ path: '/featured', component: page('featured') },
 		{ path: '/docs', component: page('docs') },
+		{ path: '/theme-editor', component: page('theme-editor') },
 		{ path: '/docs/:doc', component: page('doc'), props: true },
 		{ path: '/explore', component: page('explore') },
 		{ path: '/explore/tags/:tag', props: true, component: page('explore') },