Add support for the subsample dataset on Ceph

[MaceKuailv]

Open the more complete version of LLC4320 for the viewer.

I have changed the paths and the way indices are passed into the back end.

A new index.js is created.

[MaceKuailv]

There seems to be some problems with the test datasets of seaduck

[codecov-commenter]

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Additional details and impacted files

@@            Coverage Diff            @@
##             master      #29   +/-   ##
=========================================
  Coverage          ?   93.26%           
=========================================
  Files             ?        3           
  Lines             ?      297           
  Branches          ?        0           
=========================================
  Hits              ?      277           
  Misses            ?       20           
  Partials          ?        0           

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