Remove temp files

[ankurd1]

• Always use main.tf.json and delete it at the end
• Removed the misc temp files and the --out option
• Deleted the gen method

[codecov]

Codecov Report

Merging #79 (d23bc6f) into main (5969c9e) will decrease coverage by 0.50%.
The diff coverage is 81.81%.

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
- Coverage   78.79%   78.29%   -0.51%     
==========================================
  Files          20       20              
  Lines         863      843      -20     
==========================================
- Hits          680      660      -20     
  Misses        183      183              

Flag	Coverage Δ
unittests	78.29% <81.81%> (-0.51%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
opta/cli.py	71.09% <81.81%> (-3.00%)	⬇️

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[kevjin]

nice DEBUG env var