Fixed docs build

Author: jbtronics

docs/usage/import_export.md

@@ -20,7 +20,7 @@ Part-DB. Data can also be exported from Part-DB into various formats.
 > individually in the permissions settings.
 
 If you want to import data from PartKeepr you might want to look into the [PartKeepr migration guide]({% link
-upgrade_legacy.md %}).
+upgrade/upgrade_legacy.md %}).
 
 ### Import parts
 
@@ -158,4 +158,4 @@ information, this can lead to very large export files.
 You can export parts in all part tables. Select the parts you want via the checkbox in the table line and select the
 export format and level in the appearing menu.
 
-See the section about exporting data structures for more information about the export formats and levels.
+See the section about exporting data structures for more information about the export formats and levels.