Clean unused repo files

[nw20]

Removed:

• assets/*
• work/archives/*
• work/backend/gene_summaries.ipynb
• work/backend/gene_summaries_2.ipynb
• work/backend/initial_zarr_work.ipynb
• work/backend/setup.ipynb
• work/backend/20221221_haplotype_plots.ipynb

[review-notebook-app[bot]]

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