chore: move frontend files

frontend/histoire.config.ts

@@ -0,0 +1,34 @@
+import {defineConfig, defaultColors} from 'histoire'
+import {HstVue} from '@histoire/plugin-vue'
+import {HstScreenshot} from '@histoire/plugin-screenshot'
+
+export default defineConfig({
+	setupFile: './src/histoire.setup.ts',
+	storyIgnored: [
+		'**/node_modules/**',
+		'**/dist/**',
+		// see https://kolaente.dev/vikunja/frontend/pulls/2724#issuecomment-42012
+		'**/.direnv/**',
+	],
+	plugins: [
+		HstVue(),
+		HstScreenshot({
+			// Options here
+		}),
+	],
+	theme: {
+		title: 'Vikunja',
+		colors: {
+			// https://histoire.dev/guide/config.html#builtin-colors
+			gray: defaultColors.zinc,
+			primary: defaultColors.cyan,
+		},
+		// logo: {
+		// 	square: './img/square.png',
+		// 	light: './img/light.png',
+		// 	dark: './img/dark.png',
+		// },
+		logoHref: 'https://vikunja.io',
+		// favicon: './favicon.ico',
+	},
+})