Configurable app logo for web

[elliothershberg]

This is a small PR that adds a config slot to jbrowse-web for providing a custom logo. This should help with model organism communities who want to customize their app.

A quick way to test is to toss this config in config.json

"configuration": {
  "logoPath": {
    "uri": "/test_data/jb-logo.svg"
  }
}

[codecov]

Codecov Report

Merging #2050 (d269e9d) into main (9fc5d35) will increase coverage by 0.00%.
The diff coverage is 80.00%.

@@           Coverage Diff           @@
##             main    #2050   +/-   ##
=======================================
  Coverage   60.88%   60.88%           
=======================================
  Files         473      473           
  Lines       22564    22569    +5     
  Branches     5251     5252    +1     
=======================================
+ Hits        13737    13741    +4     
- Misses       8545     8546    +1     
  Partials      282      282           

Impacted Files	Coverage Δ
products/jbrowse-web/src/jbrowseModel.js	56.84% <ø> (ø)
packages/core/ui/App.js	78.78% <80.00%> (+0.21%)	⬆️
packages/core/util/index.ts	77.92% <0.00%> (ø)

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[cmdcolin]

Just a style note: this concept of a "function that produces JSX" should really be it's own react component

[elliothershberg]

Ahh, got it