FEAT #15407 TIME 1:30 Add associated documents

src/frontend/app/app.module.ts

.../associated-documents/associated-documents.component.html

.../associated-documents/associated-documents.component.scss

...nt/associated-documents/associated-documents.component.ts

src/frontend/app/document/document.component.html

src/frontend/app/document/document.component.ts

src/frontend/app/sidebar/sidebar.component.ts