New base code for mempool blockchain explorerer

frontend/src/app/components/start/start.component.html

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+<app-blockchain></app-blockchain>
+
+<div class="box">
+  <div class="container">
+
+    <ul class="nav nav-tabs mb-2">
+      <li class="nav-item">
+        <a class="nav-link" [class.active]="view === 'blocks'" href="#" (click)="view = 'blocks'">Blocks</a>
+      </li>
+      <li class="nav-item">
+        <a class="nav-link" [class.active]="view === 'transactions'" href="#" (click)="view = 'transactions'">Transactions</a>
+      </li>
+    </ul>
+
+    <app-latest-blocks *ngIf="view === 'blocks'; else latestTransactions"></app-latest-blocks>
+    <ng-template #latestTransactions>
+      <app-latest-transactions></app-latest-transactions>
+    </ng-template>
+  </div>
+</div>

frontend/src/app/components/start/start.component.scss

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+.search-container {
+  padding-top: 50px;
+}

frontend/src/app/components/start/start.component.spec.ts

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

frontend/src/app/components/start/start.component.ts

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+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'app-start',
+  templateUrl: './start.component.html',
+  styleUrls: ['./start.component.scss']
+})
+export class StartComponent {
+  view: 'blocks' | 'transactions' = 'blocks';
+}