Minor wording change for "Download" link

Suggesting this change simply because "ZIP" appears to be (per its specification published by PKWARE) canonically spelled uppercase.

I also added the word "archive" to provide a noun modified by "ZIP" rather than treating "ZIP" as a noun itself. It seems clearer this way, but may cause text flow issues in the design if it's too long.

client/pages/post/[id].tsx

@@ -83,7 +83,7 @@ const Post = ({ theme, changeTheme }: ThemeProps) => {
                     <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
                         <Text h2>{post.title} <VisibilityBadge visibility={post.visibility} /></Text>
                         <Button auto onClick={download}>
-                            Download as Zip
+                            Download as ZIP archive
                         </Button>
                     </div>
                     {post.files.map(({ id, content, title }: { id: any, content: string, title: string }) => (