fix: regression in import names

DocGen4/Output/Base.lean

@@ -108,7 +108,7 @@ def moduleNameToLink (n : Name) : BaseHtmlM String := do
 Returns the HTML doc-gen4 link to a module name.
 -/
 def moduleToHtmlLink (module : Name) : BaseHtmlM Html := do
-  pure <a href={←moduleNameToLink module}>{module.getString!}</a>
+  pure <a href={←moduleNameToLink module}>{module.toString}</a>
 
 /--
 Returns the LeanInk link to a module name.

DocGen4/Output/Navbar.lean

@@ -15,7 +15,7 @@ open scoped DocGen4.Jsx
 
 def moduleListFile (file : Name) : BaseHtmlM Html := do
   pure <div class={if (← getCurrentName) == file then "nav_link visible" else "nav_link"}>
-    {←moduleToHtmlLink file}
+    <a href={←moduleNameToLink file}>{file.getString!}</a>
   </div>
 
 /--