refactor: Update layout of BotPlugins page

- Changed the class of the plugin-cards div to include responsive column classes.
- Removed specific column sizes and replaced them with row-cols classes for better responsiveness.
- Added a role attribute to the div containing PluginCard component.

These changes improve the layout and responsiveness of the BotPlugins page.

src/YumeChan.NetRunner/Pages/BotPlugins.razor

@@ -15,14 +15,13 @@
 	<p class="lead">Currently Loaded : @PluginsLoader.PluginManifests.Count Plugins</p>
 </div>
 
-<div id="plugin-cards" class="row">
+<div id="plugin-cards" class="row row-cols-1 row-cols-md-2 row-cols-lg-3 g-3">
 	@foreach (IPlugin pluginManifest in PluginsLoader.PluginManifests.Values.Where(p => _isAdmin || !p.StealthMode))
 	{
-		<div class="col-12 col-md-6 col-lg-4">
+		<div role="presentation">
 			<PluginCard PluginManifest="pluginManifest" />
 		</div>
 	}
-
 </div>