优化一下博客的性能

themes/Ying/layouts/_default/_markup/render-image.html

@@ -1,10 +1,17 @@
 {{ $src := .Destination }}
+{{ $alt := .Text }}
+{{ $width := "" }}
+{{ $height := "" }}
+{{ $srcset := "" }}
+
 {{- if not (strings.HasPrefix $src "http") -}}
   {{- $img := .Page.Resources.GetMatch $src -}}
   {{- if $img -}}
     {{- $src = $img.RelPermalink -}}
+    {{- $width = printf "%d" $img.Width -}}
+    {{- $height = printf "%d" $img.Height -}}
   {{- else -}}
     {{- $src = $src | relURL -}}
   {{- end -}}
 {{- end -}}
-<img src="data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==" data-lazy-src="{{ $src }}" alt="{{ .Text }}" class="lazyload" uk-scrollspy="cls: uk-animation-fade; delay: 200">
+<img src="{{ $src }}" alt="{{ $alt }}" class="lazyload lazy-loaded" loading="lazy" decoding="async"{{ with $width }} width="{{ . }}"{{ end }}{{ with $height }} height="{{ . }}"{{ end }}>