Drop todopago integration

[WhyNotHugo]

The provider is [on very short notice] shutting down permanently.

[codecov[bot]]

Codecov Report

Merging #321 (b75d9ce) into master (d7958de) will decrease coverage by 0.06%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #321      +/-   ##
==========================================
- Coverage   80.02%   79.95%   -0.07%     
==========================================
  Files          29       28       -1     
  Lines        1857     1801      -56     
  Branches      270      263       -7     
==========================================
- Hits         1486     1440      -46     
+ Misses        259      253       -6     
+ Partials      112      108       -4     

Impacted Files	Coverage Δ
payments/authorizenet/__init__.py	86.11% <ø> (ø)
payments/stripe/forms.py	95.89% <ø> (ø)
payments/authorizenet/forms.py	92.00% <100.00%> (+6.28%)	:arrow_up:

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