Add preview image: trademark policy

frontend/src/app/components/trademark-policy/trademark-policy.component.ts

@@ -1,6 +1,7 @@
 import { Component } from '@angular/core';
 import { Env, StateService } from '../../services/state.service';
 import { SeoService } from '../../services/seo.service';
+import { OpenGraphService } from '../../services/opengraph.service';
 
 @Component({
   selector: 'app-trademark-policy',
@@ -13,10 +14,12 @@ export class TrademarkPolicyComponent {
   constructor(
     private stateService: StateService,
     private seoService: SeoService,
+    private ogService: OpenGraphService,
   ) { }
 
   ngOnInit(): void {
     this.seoService.setTitle('Trademark Policy');
     this.seoService.setDescription('An overview of the trademarks registered by Mempool Space K.K. and The Mempool Open Source Project® and what we consider to be lawful usage of those trademarks.');
+    this.ogService.setManualOgImage('trademark-policy.jpg');
   }
 }