Bump ESLint Typescript dependencies to latest

- Bump all ESLint dependencies related to TypeScript to their latest
  version. This was made possible by the resolution of compatibility
  issues with `@vue/eslint-config-airbnb-with-typescript`.
  See vuejs/eslint-config-airbnb#58 for details.
- Refactor code to comply with the latest linting configuration.
- Improve documentation in the ESLint configuration file to better
  describe the functionality and limitations of
  `@vue/typescript/recommended`.
  See vuejs/eslint-config-typescript#67 for details.
- Document functionality and limitation of `@vue/typescript/recommended`
  more clearly in ESLint configuration file.

src/presentation/components/Shared/FlatButton.vue

@@ -5,7 +5,7 @@
     type="button"
     class="flat-button"
     :class="{
-      disabled: disabled,
+      disabled,
     }"
     @click="onClicked"
   >