Add demo for 1000 genomes extended trio dataset to website

[cmdcolin]

This adds a demo for the 1000 genomes extended trio dataset reference paper (https://www.biorxiv.org/content/10.1101/2021.02.06.430068v1)

I had to do manual data munging to produce a tracklist from this data, and sometimes the NCBI servers where we fetch the data from are a little finicky and return status 200 for range requests, but it is mostly a good demo I think

[codecov]

Codecov Report

Merging #1952 (4dc89bb) into main (dde51ef) will decrease coverage by 0.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1952      +/-   ##
==========================================
- Coverage   58.80%   58.70%   -0.11%     
==========================================
  Files         460      460              
  Lines       21735    21735              
  Branches     5080     5080              
==========================================
- Hits        12781    12759      -22     
- Misses       8653     8675      +22     
  Partials      301      301              

Impacted Files	Coverage Δ
...split-view/src/components/AlignmentConnections.tsx	13.04% <ø> (ø)
...-view/src/SpreadsheetView/models/FilterControls.ts	20.00% <0.00%> (-15.56%)	⬇️
...et-view/src/SpreadsheetView/models/ImportWizard.ts	59.79% <0.00%> (-11.35%)	⬇️
...view/src/SpreadsheetView/models/SpreadsheetView.ts	31.88% <0.00%> (-5.80%)	⬇️
packages/core/util/index.ts	78.90% <0.00%> (ø)

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