Fixed javascript embedding

[IanMaquignaz]

Fixes (partially) #8

Warning!

• Still does not work in Firefox
  • images,svg, and other assets in css files are not embedded

[IanMaquignaz]

That is not the case, no changes are required.

1. b64encode() does not refer to base64.b64encode()

It refers to this function which encodes the file. This is not a new function, it's part the of the original codebase

def b64encode(path: Path) -> str:
    return base64.b64encode(path.open("rb").read()).decode()

2. Decode by defaults decodes to utf-8

bytearray.decode(encoding='utf-8', errors='strict')