refactor(obsidian): change vault directory

lua/custom/plugins/obsidian.lua

@@ -20,12 +20,8 @@ return {
   opts = {
     workspaces = {
       {
-        name = 'personal',
+        name = 'nts',
-        path = '~/Documents/personal-1',
+        path = '~/nts',
-      },
-      {
-        name = 'zk',
-        path = '~/zk',
       },
     },