Reverted the javascript sandbox

[Blatzar]

To get stable release without tons of providers broken before #491 gets fully completed this is needed, javascript testing will be done on https://github.com/vn-ki/anime-downloader/tree/javascript_sandbox which we can merge when everything is complete

[codecov]

Codecov Report

Merging #497 into master will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #497      +/-   ##
==========================================
- Coverage   18.57%   18.57%   -0.01%     
==========================================
  Files         108      108              
  Lines        4258     4254       -4     
==========================================
- Hits          791      790       -1     
+ Misses       3467     3464       -3     

Impacted Files	Coverage Δ
anime_downloader/extractors/streamango.py	0.00% <0.00%> (ø)
anime_downloader/sites/twistmoe.py	85.89% <0.00%> (ø)
anime_downloader/util.py	19.59% <0.00%> (-0.08%)	⬇️
setup.py	0.00% <ø> (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 8dd5700...aa70631. Read the comment docs.