Bug: `scripts/pdf2doc.py` fails — wrong pdf2docx class and method names

[utk2103]

scripts/pdf2doc.py cannot run. Three separate mistakes against the pdf2docx API:

from pdf2docx import Convertor   # ImportError — the class is `Converter`
cv = Convertor(pdf_file)
cv.convertor(docx_file)          # AttributeError — the method is `convert`
cv.close                         # references the method, never calls it

It also hardcodes ListsOfInbuiltMethods.pdf, which lives in resources/, so even with the names fixed the path fails from the repo root.

Expected

python scripts/pdf2doc.py resources/ListsOfInbuiltMethods.pdf output.docx

Acceptance criteria

• Converter, .convert(docx_file), .close() — correct names, close() actually called.
• Input and output paths come from argparse, not hardcoded.
• Missing input file → clear message, not a traceback.
• Verified by converting a PDF from resources/ end to end.
• Keep the "needs pip install pdf2docx" note at the top of the file.

Good first issue — the fix is small, but you'll need to install pdf2docx and actually run it.