reorganize the demo page to emphasize the cancer sv demo more

[rbuels]

The cancer demo that takes people through the SV features gives grant reviewers a good overview of things without them having to do the work to click around, which I think is important right now.

[codecov]

Codecov Report

Merging #1976 (9d94f5b) into main (690aee3) will increase coverage by 2.08%.
The diff coverage is 60.00%.

@@            Coverage Diff             @@
##             main    #1976      +/-   ##
==========================================
+ Coverage   59.70%   61.79%   +2.08%     
==========================================
  Files         470      467       -3     
  Lines       22195    21883     -312     
  Branches     5097     5097              
==========================================
+ Hits        13252    13522     +270     
+ Misses       8641     8087     -554     
+ Partials      302      274      -28     

Impacted Files	Coverage Δ
packages/core/data_adapters/BaseAdapter.ts	60.75% <0.00%> (ø)
products/jbrowse-desktop/src/rootModel.ts	36.11% <ø> (ø)
products/jbrowse-web/src/rootModel.ts	57.01% <ø> (ø)
products/jbrowse-cli/src/commands/add-track.ts	53.09% <63.15%> (+4.91%)	⬆️
...inearGenomeView/components/RefNameAutocomplete.tsx	89.36% <0.00%> (-4.26%)	⬇️
packages/core/rpc/RpcManager.ts	83.87% <0.00%> (-3.63%)	⬇️
...pes/renderers/ComparativeServerSideRendererType.ts	64.28% <0.00%> (-1.24%)	⬇️
packages/core/util/compositeMap.ts	78.78% <0.00%> (-1.22%)	⬇️
packages/core/util/aborting.ts	84.00% <0.00%> (-1.19%)	⬇️
...ew/src/SpreadsheetView/importAdapters/BedImport.ts	31.74% <0.00%> (-1.07%)	⬇️
... and 138 more

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[cmdcolin]

the page contains broken links, see https://s3.amazonaws.com/jbrowse.org/code/jb2/1322_cancer_genome_demo/?config=test_data%2Fconfig_cancer.json&session=share-kxgcLjxfgE&password=l7tXf it is access denied

[cmdcolin]

Another good addition to cancer demo would be to update this page and find a convincing breakpoint split view, because the one displayed has not much read evidence, and if possible, one that supports a gene fusion (with additional gene fusion RNA-seq type evidence displayed)

[rbuels]

this PR doesn't change any of the links. is s3 being bad again?

[cmdcolin]

I don't believe this PR or anything did it, I think the demo just has gotten stale and contains some broken links