remove non-default menus

these are the menus i could not find in the `add_menus` function
(https://github.com/nushell/nushell/blob/9a6a3a731/crates/nu-cli/src/reedline_config.rs#L86-L90)

crates/nu-utils/src/sample_config/default_config.nu

@@ -362,73 +362,6 @@ $env.config = {
             description_text: yellow
         }
       }
-      # Example of extra menus created using a nushell source
-      # Use the source field to create a list of records that populates
-      # the menu
-      {
-        name: commands_menu
-        only_buffer_difference: false
-        marker: "# "
-        type: {
-            layout: columnar
-            columns: 4
-            col_width: 20
-            col_padding: 2
-        }
-        style: {
-            text: green
-            selected_text: green_reverse
-            description_text: yellow
-        }
-        source: { |buffer, position|
-            scope commands
-            | where name =~ $buffer
-            | each { |it| {value: $it.name description: $it.usage} }
-        }
-      }
-      {
-        name: vars_menu
-        only_buffer_difference: true
-        marker: "# "
-        type: {
-            layout: list
-            page_size: 10
-        }
-        style: {
-            text: green
-            selected_text: green_reverse
-            description_text: yellow
-        }
-        source: { |buffer, position|
-            scope variables
-            | where name =~ $buffer
-            | sort-by name
-            | each { |it| {value: $it.name description: $it.type} }
-        }
-      }
-      {
-        name: commands_with_description
-        only_buffer_difference: true
-        marker: "# "
-        type: {
-            layout: description
-            columns: 4
-            col_width: 20
-            col_padding: 2
-            selection_rows: 4
-            description_rows: 10
-        }
-        style: {
-            text: green
-            selected_text: green_reverse
-            description_text: yellow
-        }
-        source: { |buffer, position|
-            scope commands
-            | where name =~ $buffer
-            | each { |it| {value: $it.name description: $it.usage} }
-        }
-      }
   ]
 
   keybindings: [