feat(ui): group dashboard navigation into sectioned routes and align view layouts with dcrouter

ts_web/elements/sipproxy-view-phone.ts

@@ -617,6 +617,8 @@ export class SipproxyViewPhone extends DeesElement {
 
   public render(): TemplateResult {
     return html`
+      <dees-heading level="3">Phone</dees-heading>
+
       <div class="phone-layout">
         ${this.renderDialer()}
         ${this.renderPhoneStatus()}