update base notebooks to not use homedirs

[mgeplf]

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[codecov-commenter]

Codecov Report

Merging #163 (f594539) into master (b3342d0) will not change coverage.
The diff coverage is n/a.

❗ Current head f594539 differs from pull request most recent head c021f6f. Consider uploading reports for the commit c021f6f to get more accurate results

@@            Coverage Diff             @@
##            master      #163    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           31        23     -8     
  Lines         2241      1972   -269     
==========================================
- Hits          2241      1972   -269     

Flag	Coverage Δ
pytest	100.00% <ø> (ø)

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Impacted Files	Coverage Δ
bluepysnap/cli.py	100.00% <0.00%> (ø)
bluepysnap/circuit_validation.py	100.00% <0.00%> (ø)
bluepysnap/nexus/entity.py
bluepysnap/schemas/__init__.py
bluepysnap/schemas/schemas.py
bluepysnap/nexus/core.py
bluepysnap/nexus/factory.py
bluepysnap/nexus/__init__.py
bluepysnap/nexus/tools.py
bluepysnap/nexus/connector.py

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