fix: added BASE_URL support

client/components/Header.tsx

@@ -1,5 +1,6 @@
 import { Link } from 'preact-router/match'
 import { isAdministrator, User, UserRole } from '../../shared/model'
+import { prependBaseUrl } from '../api'
 
 const ROLE_LABEL: Record<UserRole, string> = {
     ['admin']: 'Admin',
@@ -15,7 +16,7 @@ type Props = {
 export const Header = ({ user, noLogin }: Props) => (
     <header>
         <div class="logo">
-            <a href="/">PHC / Problemi</a>
+            <a href={prependBaseUrl('/')}>PHC / Problemi</a>
         </div>
         <nav>
             {user ? (