Rewrite of WebUI (#245)

Rewrite of the UI using Typescript, Vue3, Windicss and Vite. The design should  be close to the current one with some changes:
- latest pipeline in a sidebar on the right
- secrets and registry as part of the repo-settings (secrets and registry entries shouldn't be used as much so they can be "hidden" under settings IMO)
- start page shows list of active repositories with button to enable / add new ones (currently you see all repositories and in most cases you only add new repositories once in a while)

web/windi.config.ts

@@ -0,0 +1,25 @@
+/* eslint-disable import/no-extraneous-dependencies */
+import colors from 'windicss/colors';
+import { defineConfig } from 'windicss/helpers';
+import typography from 'windicss/plugin/typography';
+
+export default defineConfig({
+  darkMode: 'class',
+  theme: {
+    extend: {
+      colors: {
+        greenish: '#4caf50',
+        link: colors.blue[400],
+        'dark-gray': {
+          600: '#383c4a',
+          700: '#303440',
+          800: '#2a2e3a',
+          900: '#2e323e',
+        },
+      },
+      stroke: (theme) => theme('colors'),
+      fill: (theme) => theme('colors'),
+    },
+  },
+  plugins: [typography],
+});