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/.prettierrc.js

@@ -0,0 +1,8 @@
+module.exports = {
+  semi: true,
+  trailingComma: 'all',
+  singleQuote: true,
+  printWidth: 120,
+  tabWidth: 2,
+  endOfLine: 'lf',
+};