Refactor Carousel.js

[cdrini]

Preparatory refactor to #8781

Technical

• Make carousel component take in data-config like other elements
• Make it not need a selector; augments the html element it's on.
• Remove unnecessary index.js file

Testing

• Tested on pages:
  • ✅ Subjects page
  • ✅* Publishers page
    • Loading more pages doesn't work, but that appears to be broken on staging as well.
  • ✅ Collection page
  • ✅ Homepage ( ✅ books, ✅ welcome, ✅ subjects )
  • ✅ Book page carousels at bottom
  • ✅ My books page components
  • ✅ Loans page components

Screenshot

Stakeholders

[codecov-commenter]

Codecov Report

Attention: 83 lines in your changes are missing coverage. Please review.

Comparison is base (7927be4) 16.62% compared to head (a3a29df) 16.63%.

Files	Patch %	Lines
...ibrary/plugins/openlibrary/js/carousel/Carousel.js	0.00%	64 Missing and 13 partials ⚠️
openlibrary/plugins/openlibrary/js/index.js	0.00%	4 Missing ⚠️
...brary/plugins/openlibrary/js/carousels_partials.js	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8782      +/-   ##
==========================================
+ Coverage   16.62%   16.63%   +0.01%     
==========================================
  Files          88       87       -1     
  Lines        4698     4695       -3     
  Branches      838      829       -9     
==========================================
  Hits          781      781              
- Misses       3399     3408       +9     
+ Partials      518      506      -12     

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