add option for using extended base46 integrations

lua/core/default_config.lua

@@ -15,6 +15,9 @@ M.ui = {
   transparency = false,
   lsp_semantic_tokens = false, -- needs nvim v0.9, just adds highlight groups for lsp semantic tokens
 
+  -- https://github.com/NvChad/base46/tree/v2.0/lua/base46/extended_integrations
+  extended_integrations = {}, -- these aren't compiled by default, ex: "alpha", "notify"
+
   -- cmp themeing
   cmp = {
     icons = true,