Add grid-cards style for videos widget

internal/assets/templates/video-card-contents.html

@@ -0,0 +1,12 @@
+{{ define "video-card-contents" }}
+<img class="video-thumbnail thumbnail" loading="lazy" src="{{ .ThumbnailUrl }}" alt="">
+<div class="margin-top-10 margin-bottom-widget flex flex-column grow padding-inline-widget">
+    <a class="video-title color-primary-if-not-visited" href="{{ .Url }}" target="_blank" rel="noreferrer" title="{{ .Title }}">{{ .Title }}</a>
+    <ul class="list-horizontal-text flex-nowrap margin-top-7">
+        <li class="shrink-0" title="{{ .TimePosted | formatTime }}" {{ dynamicRelativeTimeAttrs .TimePosted }}>{{ .TimePosted | relativeTime }}</li>
+        <li class="shrink min-width-0">
+            <a class="block text-truncate" href="{{ .AuthorUrl }}" target="_blank" rel="noreferrer">{{ .Author }}</a>
+        </li>
+    </ul>
+</div>
+{{ end }}