refactor!: remove named export 'parse()'

This is an internal method and never meant to be called by users.
Furthermore, the default export `Psd` class also has a static `parse()`
method, which could be easily confused with the method.
Thus, we're removing it from the list of exports.

Also edit Node.js example script, which was previously using this
`parse()` to print information to the console (indicating successful
parse). Instead, stringify and print the `Psd` object directly.

packages/example-node/script.js

@@ -6,12 +6,12 @@ import * as fs from "fs";
 import * as path from "path";
 import {fileURLToPath} from "url";
 
-import * as Psd from "@webtoon/psd";
+import Psd from "@webtoon/psd";
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 
 const file_path = path.resolve(__dirname, "./example.psd");
 const psd_file = fs.readFileSync(file_path);
 
 const psd = Psd.parse(psd_file.buffer);
-console.log(psd.fileHeader);
+console.log(psd);

packages/psd/src/index.ts

@@ -7,6 +7,5 @@ import {Psd} from "./classes";
 export type {Group, Layer, Node, NodeChild, NodeParent, Slice} from "./classes";
 export {ColorMode, Depth, GuideDirection, SliceOrigin} from "./interfaces";
 export type {Guide} from "./interfaces";
-export {parse} from "./methods";
 
 export default Psd;