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/shared/icons.module.ts

@@ -5,31 +5,44 @@ import { NgModule } from '@angular/core';
 import { FontAwesomeModule } from '@fortawesome/angular-fontawesome';
 import { library } from '@fortawesome/fontawesome-svg-core';
 import {
+  faArchive,
   faBars,
   faBell,
+  faCalendar,
   faChartBar,
   faCheckCircle,
+  faChevronDown,
   faChevronLeft,
   faChevronRight,
   faCircle,
   faCog,
+  faCogs,
   faEdit,
   faEye,
   faEyeSlash,
   faFileUpload,
   faFillDrip,
+  faHandHoldingUsd,
   faHome,
+  faLink,
+  faList,
   faLocationArrow,
   faLock,
   faLockOpen,
+  faMinusCircle,
   faMoneyBillAlt,
+  faPlay,
   faPlus,
+  faPlusCircle,
   faSearch,
   faShieldAlt,
   faSignOutAlt,
   faSitemap,
   faSync,
   faTachometerAlt,
+  faTimesCircle,
+  faTrash,
+  faUndo,
   faUniversity,
   faUserCircle,
   faUsers,
@@ -38,31 +51,44 @@ import {
 
 /** Add icons to the library for convenient access in other components. */
 library.add(
+  faArchive,
   faBars,
   faBell,
+  faCalendar,
   faChartBar,
   faCheckCircle,
+  faChevronDown,
   faChevronLeft,
   faChevronRight,
   faCircle,
   faCog,
+  faCogs,
   faEdit,
   faEye,
   faEyeSlash,
   faFileUpload,
   faFillDrip,
+  faHandHoldingUsd,
   faHome,
+  faLink,
+  faList,
   faLocationArrow,
   faLock,
   faLockOpen,
+  faMinusCircle,
   faMoneyBillAlt,
+  faPlay,
   faPlus,
+  faPlusCircle,
   faSearch,
   faShieldAlt,
   faSignOutAlt,
   faSitemap,
   faSync,
   faTachometerAlt,
+  faTimesCircle,
+  faTrash,
+  faUndo,
   faUniversity,
   faUserCircle,
   faUsers,