Use local h2_new.txt instead of Dropbox download

[yurekami]

Summary

• Replace the wget command in sec1_basic.ipynb that downloads h2_new.txt from Dropbox with a simple file copy from the repository's examples/vqe/ directory
• The file is already included in the repository, eliminating the need for external downloads

Problem

The notebook cell that downloads h2_new.txt from Dropbox:

! wget https://www.dropbox.com/s/1rtttfxoo02s09e/h2_new.txt

This fails because:

• The Dropbox link may become unavailable
• It may require authentication
• External dependencies make the notebook less reliable

Solution

Copy from the local repository instead:

import shutil
shutil.copy('examples/vqe/h2_new.txt', 'h2_new.txt')

Test plan

• Run the VQE section of sec1_basic.ipynb
• Verify h2_new.txt is correctly copied and parsed

Fixes #302

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