WIP Progress on skeleton of the Vue app.

web/src/types/index.d.ts

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+export * from './nav-next';

web/src/types/nav-next.d.ts

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+import { Vue } from 'vue-property-decorator';
+import { RawLocation } from 'vue-router';
+
+export type NavNext = (to?: RawLocation | false | ((vm: Vue) => any) | void) => void;