Rework wikilinks feature

render.go

@@ -19,12 +19,12 @@ import (
 
 var md goldmark.Markdown
 
-// initMarkdown builds the package-level goldmark instance. Called once from
-// main after the wiki root is known so the wiki-link extension can resolve
-// targets against the filesystem.
-func initMarkdown(root string) {
+// initMarkdown builds the package-level goldmark instance. Neither extension
+// resolves anything against the filesystem — wiki links are search queries and
+// embed destinations are relative to the page — so this needs no wiki root.
+func initMarkdown() {
 	md = goldmark.New(
-		goldmark.WithExtensions(extension.GFM, extension.Table, newWikiLinkExt(root), newWikiEmbedExt(root)),
+		goldmark.WithExtensions(extension.GFM, extension.Table, newWikiLinkExt(), newEmbedExt()),
 		goldmark.WithParserOptions(parser.WithAutoHeadingID()),
 		goldmark.WithRendererOptions(html.WithUnsafe(), html.WithHardWraps()),
 	)