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/accounting/accounting-rules/accounting-rules.component.scss

@@ -1,3 +1,7 @@
 table {
   width: 100%;
+
+  .select-row:hover {
+    cursor: pointer;
+  }
 }