feat(carto): updated behavior to join structure from structure details page

src/app/app-routing.module.ts

src/app/form/form-view/form-view.module.ts

...lobal-components/progress-bar/progress-bar.component.scss

src/app/login/login.component.ts

src/app/shared/components/index.ts

...-join-confirmation/modal-join-confirmation.component.html

...-join-confirmation/modal-join-confirmation.component.scss

...in-confirmation/modal-join-confirmation.component.spec.ts

...al-join-confirmation/modal-join-confirmation.component.ts

src/app/structure-join/structure-join.component.html

src/app/structure-join/structure-join.component.scss

src/app/structure-join/structure-join.component.ts

...onents/structure-details/structure-details.component.html

...mponents/structure-details/structure-details.component.ts

src/assets/form/sprite.svg