fix(header): Add href input

Author: youda97

src/ui-shell/header/header-item.component.ts

@@ -1,13 +1,15 @@
-import { Component } from "@angular/core";
+import { Component, Input } from "@angular/core";
 
 @Component({
 	selector: "ibm-header-item",
 	template: `
 		<li style="height: 100%">
-			<a class="bx--header__menu-item" href="javascript:void(0)" role="menuitem" tabindex="0">
+			<a class="bx--header__menu-item" [href]="href" role="menuitem" tabindex="0">
 				<ng-content></ng-content>
 			</a>
 		</li>
 	`
 })
-export class HeaderItem { }
+export class HeaderItem {
+	@Input() href = "#";
+}