Allow Image component to not use async decoding

src/components/atoms/Image.svelte

@@ -10,6 +10,7 @@
     export let ratio: number = undefined
     export let alt: string
     export let lazy: boolean = true
+    export let decoding: "auto" | "sync" | "async" = "auto"
 
     interface Sizes {
         small?: { width?: number, height?: number }
@@ -78,8 +79,8 @@
         srcset={srcSet.jpg.join(', ').trim()}
         width={imgWidth}
         height={imgHeight}
-        alt={alt}
+        {alt}
         loading={lazy ? 'lazy' : undefined}
-        decoding={lazy ? "async" : undefined}
+        {decoding}
     />
 </picture>