feat(admin): add a loop to render all of the structures + add buttons to...

src/app/admin/admin.module.ts

src/app/admin/admin.scss

...ts/button-cell-renderer/button-cell-renderer.component.ts

src/app/admin/components/nav-bar/nav-bar.component.html

src/app/admin/components/nav-bar/nav-bar.component.scss

src/app/admin/components/nav-bar/nav-bar.component.ts

...ents/structures-list/admin-structures-list.component.html

...ents/structures-list/admin-structures-list.component.scss

...onents/structures-list/admin-structures-list.component.ts

src/app/admin/models/adminStructureList.interface.ts

src/app/admin/services/admin.service.ts

src/app/models/structure.model.ts