Bugfix remove tox to fix black-action issue

[falkecarlsen]

Due to unresolved issues with running black through tox, I suggest removing tox and simply running black locally according to CONTRIBUTING.md to adhere to coding standards.

[codecov-commenter]

Codecov Report

Merging #250 (d10649c) into next (7ace8fd) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             next     #250   +/-   ##
=======================================
  Coverage   82.48%   82.48%           
=======================================
  Files          30       30           
  Lines        2255     2255           
  Branches      157      157           
=======================================
  Hits         1860     1860           
  Misses        370      370           
  Partials       25       25           

Impacted Files	Coverage Δ
stregreport/forms.py	100.00% <ø> (ø)
stregreport/tests.py	100.00% <ø> (ø)
stregreport/views.py	47.03% <ø> (ø)
stregsystem/tests.py	99.73% <100.00%> (ø)
stregsystem/views.py	61.13% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7ace8fd...d10649c. Read the comment docs.

[joandrsn]