ufo: add provider_selector, use treesitter as main provider

re-introducing the `provider_selector` setting which encountered issues
with a previous version. Though is the idiomatic and cleaner way to
achieve the desired result.

lua/nxvim/plugins/ufo.lua

@@ -10,6 +10,7 @@ ufo.setup({
 		default = { "imports", "comment" },
 		markdown = {},
 		git = {},
+		svelte = { "comment" },
 		NeogitStatus = {},
 	},
 	preview = {
@@ -26,15 +27,12 @@ ufo.setup({
 		},
 	},
 	enable_get_fold_virt_text = false,
-})
--- ]
-
--- == [ Events ================================================================
-
-nx.au({
-	"FileType",
-	pattern = { "markdown", "NeogitStatus" },
-	callback = function() ufo.detach() end,
+	provider_selector = function(bufnr, filetype, buftype)
+		for _, type in ipairs({ "markdown", "NeogitStatus" }) do
+			if filetype == type then return "" end
+		end
+		return { "treesitter", "indent" }
+	end,
 })
 -- ]