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/self-service/self-service.component.ts

@@ -1,5 +1,11 @@
+/** Angular Imports */
 import { Component, OnInit } from '@angular/core';
 
+/**
+ * Self service component.
+ *
+ * All components related to self service admin portal are routed here.
+ */
 @Component({
   selector: 'mifosx-self-service',
   templateUrl: './self-service.component.html',