modified portfolio section and optimize images

layouts/partials/portfolio.html

@@ -41,7 +41,7 @@
 		<div class="row shuffle-wrapper justify-content-center">
 			{{"<!-- portfolio item -->" | safeHTML}}
 			{{ range .portfolio_item }}
-			<div class="col-lg-4 shuffle-item"
+			<div class="col-lg-4 col-md-6 shuffle-item"
 				data-groups="[{{range $index, $element:= .categories }}{{if ne $index 0}},{{end}}&quot;{{. | urlize}}&quot;{{ end }}]">
 				<div class="portfolio-block mb-4">
 					<img class="img-fluid" src="{{ .image_webp | absURL }}" onerror="this.onerror=null;this.src='{{ .image | absURL }}'" alt="{{ .name }}">