Implement new UI component for icons #230

- Introduce `AppIcon.vue`, offering improved performance over the
  previous `fort-awesome` dependency. This implementation reduces bundle
  size by 67.31KB (tested for web using `npm run build -- --mode prod`).
- Migrate Font Awesome 5 icons to Font Awesome 6.

This commit facilitates migration to Vue 3.0 (#230) and ensures no Vue
component remains tightly bound to a specific Vue version, enhancing
code portability.

Font Awesome license is not included because Font Awesome revokes its
right:

> "Attribution is no longer required as of Font Awesome 3.0"
>
> Sources:
>
> - https://fontawesome.com/v4/license/ (archived: https://web.archive.org/web/20231003213441/https://fontawesome.com/v4/license/, https://archive.ph/Yy9j5)
> - https://github.com/FortAwesome/Font-Awesome/wiki (archived: https://web.archive.org/web/20231003214646/https://github.com/FortAwesome/Font-Awesome/wiki, https://archive.ph/C6sXv)

This commit removes following third-party production dependencies:

- `@fortawesome/vue-fontawesome`
- `@fortawesome/free-solid-svg-icons`
- `@fortawesome/free-regular-svg-icons`
- `@fortawesome/free-brands-svg-icons`
- `@fortawesome/fontawesome-svg-core`

src/presentation/assets/icons/folder.svg

@@ -0,0 +1 @@
+<!-- Source: Font Awesome 6 --><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M0 96C0 60.7 28.7 32 64 32H196.1c19.1 0 37.4 7.6 50.9 21.1L289.9 96H448c35.3 0 64 28.7 64 64V416c0 35.3-28.7 64-64 64H64c-35.3 0-64-28.7-64-64V96zM64 80c-8.8 0-16 7.2-16 16V416c0 8.8 7.2 16 16 16H448c8.8 0 16-7.2 16-16V160c0-8.8-7.2-16-16-16H286.6c-10.6 0-20.8-4.2-28.3-11.7L213.1 87c-4.5-4.5-10.6-7-17-7H64z"/></svg>