minor tweak: links in markdown shown in kanban are now opened in a new tab

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

frontend/src/routes/project/Kanban.svelte

@@ -2,7 +2,7 @@
     import { onMount }       from 'svelte';
     import { useTinyRouter } from 'svelte-tiny-router';
 
-    import { api }           from '../../urls.svelte.js';
+    import { api, target }   from '../../urls.svelte.js';
     import { error, yikes }  from '../../warn.svelte';
     import { t }             from '../../translations.svelte.js';
     import { user }          from '../../user.svelte.js';
@@ -217,7 +217,7 @@
 {#if project}
 <fieldset class="kanban description {descr?'active':''}" onclick={e => descr = !descr}>
     <legend>{t('description')} – {t('expand_on_click')}</legend>
-    {@html project.description.rendered}
+    {@html target(project.description.rendered)}
 </fieldset>
 <div class="kanban" style="display: grid; grid-template-columns: {`repeat(${columns}, auto)`}">
     <span class="filter">