fix: only select images that have non-data src

Previously, when the image url contained data, it tried to parse an url
and failed, instead of keeping data.

It have been fixed so that images where url is starting by 'data' are
not modified.

crieur-retrieve/src/tools/self_contained_html.rs

@@ -92,7 +92,7 @@ where
     //
     let image_urls = {
         let document = Document::from(&html);
-        let imgs = document.select("img");
+        let imgs = document.select("img:not([src^=\"data:\"])");
 
         imgs.iter()
             .map(|image| {
@@ -115,7 +115,7 @@ where
 
     let html = {
         let document = Document::from(&html);
-        let imgs = document.select("img");
+        let imgs = document.select("img:not([src^=\"data:\"])");
 
         imgs.iter()
             .zip(downloaded_images.iter())