consolidate build scripts, reorganize source into src/ directory, fix favicon injection

src/shims/crypto/scrypt.js

@@ -0,0 +1,26 @@
+export function scrypt(password, salt, keylen, options, callback) {
+  if (typeof options === "function") {
+    callback = options;
+    options = {};
+  }
+
+  const N = options?.N || 32768;
+  const r = options?.r || 8;
+  const p = options?.p || 1;
+
+  if (window.scrypt && window.scrypt.scrypt) {
+    const pwBytes =
+      typeof password === "string"
+        ? new TextEncoder().encode(password)
+        : password;
+    const saltBytes =
+      typeof salt === "string" ? new TextEncoder().encode(salt) : salt;
+
+    window.scrypt
+      .scrypt(pwBytes, saltBytes, N, r, p, keylen)
+      .then((result) => callback(null, new Uint8Array(result)))
+      .catch((err) => callback(err));
+  } else {
+    callback(new Error("scrypt not available"));
+  }
+}