Remove bnl and old_code directories

[valeriupredoi]

Description

@bnlawrence these are old stale directories that should be removed, please holler back if you still need any of the stiff there 🍺

Related to #231

Before you get started

• ☝ Create an issue to discuss what you are going to do

Checklist

• This pull request has a descriptive title and labels
• This pull request has a minimal description (most was discussed in the issue, but a two-liner description is still desirable)
• Unit tests have been added (if codecov test fails)
• Any changed dependencies have been added or removed correctly (if need be)
• If you are working on the documentation, please ensure the current build passes
• All tests pass

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.00%. Comparing base (8c8aa26) to head (f9f4632).
⚠️ Report is 19 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #283   +/-   ##
=======================================
  Coverage   86.00%   86.00%           
=======================================
  Files           7        7           
  Lines         643      643           
=======================================
  Hits          553      553           
  Misses         90       90           

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[bnlawrence]

All good. Thanks.

[valeriupredoi]

All good. Thanks.

cheers, Bryan 🍻