workshop: reconcile english and japanese version

[proppy]

• clean english output
• update japansee code cells
• add missing TODO
• remove config.json instructions
• fix headings

TEST=https://colab.research.google.com/github/proppy/silicon-notebooks/blob/reconcile/xls-workshop-openlane.ipynb TEST=https://colab.research.google.com/github/proppy/silicon-notebooks/blob/reconcile/xls-workshop-openlane-ja.ipynb

@shige-compit

[proppy]

Merging so we can get up to date instructions at the next workshop.