animint2pages() create dir, remove err file, tests

[tdhock]

Closes #202
Closes #134

[tdhock]

hi @animint/developers can you please review this PR?

especially @Faye-yufan

[tdhock]

@suhaani-agarwal
@biplab-sutradhar
can you please review this PR?

[codecov]

Codecov Report

❌ Patch coverage is 20.00000% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.70%. Comparing base (940cf7d) to head (3de38db).
⚠️ Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
R/z_pages.R	20.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #201      +/-   ##
==========================================
- Coverage   77.76%   77.70%   -0.07%     
==========================================
  Files         164      164              
  Lines        8771     8777       +6     
  Branches      564      553      -11     
==========================================
- Hits         6821     6820       -1     
- Misses       1950     1957       +7     

Flag	Coverage Δ
javascript	95.39% <ø> (ø)
r	69.61% <20.00%> (-0.09%)	⬇️

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