refractor: accounting module (#300)

* Refractor components.
* Add resolvers.
* Add relative router links.
* Replace mat-icons by font-awesome icons.
* Add comments.

Fixes: #298

src/app/core/shell/breadcrumb/breadcrumb.component.scss

@@ -2,6 +2,7 @@
   margin: 0 auto;
   max-width: 74rem;
   width: 90%;
+  word-wrap: break-word;
 
   .breadcrumb {
     list-style: none;