Add seminar as valid path in CMS

sigpwny.com/public/manage/config.yml

@@ -54,7 +54,7 @@ collections:
     sortable_fields: ['date', 'title']
     # adding a meta object with a path property allows editing the path of entries
     # moving an existing entry will move the entire sub tree of the entry to the new location
-    meta: { path: { widget: string, label: 'Path', index_file: 'index', hint: 'Examples: "sp2023/general/2023-01-01" or "fa2023/ctf/2023-08-01". All characters must be lowercase.', pattern: ['^(fa|sp)[0-9]{4}/(general|ctf|purple|embedded)/[0-9]{4}-[0-9]{2}-[0-9]{2}$', 'Refer to example path'] } }
+    meta: { path: { widget: string, label: 'Path', index_file: 'index', hint: 'Examples: "sp2023/general/2023-01-01" or "fa2023/ctf/2023-08-01". All characters must be lowercase.', pattern: ['^(fa|sp)[0-9]{4}/(general|seminar|ctf|purple|embedded)/[0-9]{4}-[0-9]{2}-[0-9]{2}$', 'Refer to example path'] } }
 
   - name: 'events'
     label: 'Events'