replace intellitab with auto-indent

after/plugin/auto-indent.lua

@@ -0,0 +1,10 @@
+local status_ok, indent = pcall(require, "auto-indent")
+if not status_ok then
+	return
+end
+
+indent.setup {
+  indentexpr = function(lnum)
+    return require("nvim-treesitter.indent").get_indent(lnum)
+  end
+}

after/plugin/cmp.lua

@@ -89,7 +89,7 @@ cmp.setup {
       elseif neogen.jumpable() then
         neogen.jump_next()
       else
-        require("intellitab").indent()
+        fallback()
       end
     end, { "i", "s" }),
     ["<S-Tab>"] = cmp.mapping(function(fallback)