Add Single file archive method.

pages/api/v1/archives/[linkId].ts

@@ -27,6 +27,7 @@ export default async function Index(req: NextApiRequest, res: NextApiResponse) {
   else if (format === ArchivedFormat.jpeg) suffix = ".jpeg";
   else if (format === ArchivedFormat.pdf) suffix = ".pdf";
   else if (format === ArchivedFormat.readability) suffix = "_readability.json";
+  else if (format === ArchivedFormat.singlefile) suffix = ".html";
 
   //@ts-ignore
   if (!linkId || !suffix)

pages/api/v1/links/[id]/archive/index.ts

@@ -76,6 +76,7 @@ const deleteArchivedFiles = async (link: Link & { collection: Collection }) => {
       image: null,
       pdf: null,
       readable: null,
+      singlefile: null,
       preview: null,
     },
   });
@@ -89,6 +90,9 @@ const deleteArchivedFiles = async (link: Link & { collection: Collection }) => {
   await removeFile({
     filePath: `archives/${link.collection.id}/${link.id}_readability.json`,
   });
+  await removeFile({
+    filePath: `archives/${link.collection.id}/${link.id}.html`,
+  });
   await removeFile({
     filePath: `archives/preview/${link.collection.id}/${link.id}.png`,
   });