refractor: self service module (#291)

* Refractor components.
* Improve responsiveness of components.
* Add task management component.
* Add users data resolver.
* Add relative router links.
* Replace mat-icons by font-awesome icons.
* Add comments.

Fixes #290

src/app/shared/icons.module.ts

@@ -11,7 +11,9 @@ import {
   faCheckCircle,
   faChevronLeft,
   faChevronRight,
+  faCircle,
   faCog,
+  faEdit,
   faEye,
   faEyeSlash,
   faFileUpload,
@@ -19,6 +21,7 @@ import {
   faHome,
   faLocationArrow,
   faLock,
+  faLockOpen,
   faMoneyBillAlt,
   faPlus,
   faSearch,
@@ -41,7 +44,9 @@ library.add(
   faCheckCircle,
   faChevronLeft,
   faChevronRight,
+  faCircle,
   faCog,
+  faEdit,
   faEye,
   faEyeSlash,
   faFileUpload,
@@ -49,6 +54,7 @@ library.add(
   faHome,
   faLocationArrow,
   faLock,
+  faLockOpen,
   faMoneyBillAlt,
   faPlus,
   faSearch,