Issue: User can only edit their own posts (#12)

client/src/app/app-routing.module.ts

client/src/app/app.component.html

client/src/app/app.component.scss

client/src/app/app.component.ts

client/src/app/authentication/auth.service.ts

client/src/app/models/post.model.ts

client/src/app/models/user.model.ts

...nt/src/app/posts/post-details/post-details.component.html

client/src/app/posts/post-details/post-details.component.ts

client/src/app/posts/post-form/post-form.component.ts

...rc/app/users/user-login-form/user-login-form.component.ts

client/src/app/users/user-profile/user-profile.component.ts

server/src/models/post.ts