Added Birthdays page

Introduced a new BirthdaysComponent with its corresponding HTML, SCSS, and spec files. Added a route for '/birthdays' in the application and integrated it into the module and routing. This component showcases staff and previous staff birthdays.

frontend/src/app/birthdays/birthdays.component.html

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+<ng-container>
+  <app-header [current_page]="'birthdays'" height="460px" background_image="/public/img/backgrounds/staff.png"
+              [overlay_gradient]="0.5">
+    <div class="title" header-content>
+      <h1>Famous Altitude Staff Birthdays</h1>
+      <h2>(and previous staff)</h2>
+    </div>
+  </app-header>
+
+  <main>
+    <section class="darkmodeSection">
+      <div class="container" style="padding: 50px 0 0 0; justify-content: center;">
+      </div>
+    </section>
+  </main>
+</ng-container>

frontend/src/app/birthdays/birthdays.component.spec.ts

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+import { ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { BirthdaysComponent } from './birthdays.component';
+
+describe('BirthdaysComponent', () => {
+  let component: BirthdaysComponent;
+  let fixture: ComponentFixture<BirthdaysComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [BirthdaysComponent]
+    })
+    .compileComponents();
+
+    fixture = TestBed.createComponent(BirthdaysComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

frontend/src/app/birthdays/birthdays.component.ts

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+import {Component} from '@angular/core';
+import {ScrollService} from '../scroll/scroll.service';
+
+@Component({
+  selector: 'app-birthdays',
+  standalone: false,
+  templateUrl: './birthdays.component.html',
+  styleUrl: './birthdays.component.scss'
+})
+export class BirthdaysComponent {
+  constructor(public scrollService: ScrollService) {
+  }
+}