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/components/Scripts/View/TheScriptsView.vue

@@ -18,7 +18,7 @@
             class="search__query__close-button"
             v-on:click="clearSearchQuery()"
           >
-            <font-awesome-icon :icon="['fas', 'times']" />
+            <AppIcon icon="xmark" />
           </div>
         </div>
         <div v-if="!searchHasMatches" class="search-no-matches">
@@ -41,6 +41,7 @@ import {
   defineComponent, PropType, ref, computed,
   inject,
 } from 'vue';
+import AppIcon from '@/presentation/components/Shared/Icon/AppIcon.vue';
 import { InjectionKeys } from '@/presentation/injectionSymbols';
 import ScriptsTree from '@/presentation/components/Scripts/View/Tree/ScriptsTree.vue';
 import CardList from '@/presentation/components/Scripts/View/Cards/CardList.vue';
@@ -52,6 +53,7 @@ export default defineComponent({
   components: {
     ScriptsTree,
     CardList,
+    AppIcon,
   },
   props: {
     currentView: {