Re-define sub mining routes properly and use router outlet

frontend/src/app/components/hashrate-chart/hashrate-chart.component.html

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+<p>hashrate-chart works!</p>

frontend/src/app/components/hashrate-chart/hashrate-chart.component.ts

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+import { Component, OnInit } from '@angular/core';
+
+@Component({
+  selector: 'app-hashrate-chart',
+  templateUrl: './hashrate-chart.component.html',
+  styleUrls: ['./hashrate-chart.component.scss']
+})
+export class HashrateChartComponent implements OnInit {
+
+  constructor() { }
+
+  ngOnInit(): void {
+  }
+
+}

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

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+<router-outlet></router-outlet>

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

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+import { Component, OnInit } from '@angular/core';
+
+@Component({
+  selector: 'app-mining-start',
+  templateUrl: './mining-start.component.html',
+})
+export class MiningStartComponent implements OnInit {
+
+  constructor() { }
+
+  ngOnInit(): void {
+  }
+
+}