add clean

[t-kurasawa]

Delete only data_files and init the project.
close #58

[codecov]

Codecov Report

Merging #95 (55feeee) into main (d0c24eb) will decrease coverage by 1.35%.
The diff coverage is 52.94%.

@@             Coverage Diff             @@
##              main      #95      +/-   ##
===========================================
- Coverage   100.00%   98.64%   -1.36%     
===========================================
  Files           18       18              
  Lines         1153     1185      +32     
  Branches       127      127              
===========================================
+ Hits          1153     1169      +16     
- Misses           0       16      +16     

Impacted Files	Coverage Δ
libs/actions.ts	94.53% <15.78%> (-5.47%)	⬇️
dim.ts	100.00% <100.00%> (ø)

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[ryo-ma]

LGTM