Fix #287 Update Makefile

[anevolbap]

Closes #287.

To test it, I created a new virtual environment (with pyenv) from scratch and ran the installation commands and the Makefile commands as well.

This PR seems to overlap a bit with this one.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.10%. Comparing base (3bb81a7) to head (13106b1).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #309   +/-   ##
=======================================
  Coverage   77.10%   77.10%           
=======================================
  Files          21       21           
  Lines        1380     1380           
=======================================
  Hits         1064     1064           
  Misses        316      316           

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[drbenvincent]

Great. This addresses #287. Thanks for pointing out that this overlaps with #304 - that PR got a bit unwieldy because it simultaneously tried to make the changes to the makefile and move to a conda only install. I think I'll merge this PR now because it focusses #287 solely.