Update docs for modifications/methylation coloring, plugin store, and the sequence panel in feature details

[cmdcolin]

This adds a little documentation on

• Modifications coloring
• Plugin store
• Sequence detail panel

Also adds the current jbrowse version number to the jbrowse2.pdf

[codecov]

Codecov Report

Merging #2007 (b90f5da) into main (a988ffe) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2007      +/-   ##
==========================================
- Coverage   60.95%   60.94%   -0.01%     
==========================================
  Files         471      471              
  Lines       22515    22515              
  Branches     5234     5234              
==========================================
- Hits        13723    13722       -1     
- Misses       8509     8510       +1     
  Partials      283      283              

Impacted Files	Coverage Δ
...inearGenomeView/components/RefNameAutocomplete.tsx	88.88% <0.00%> (-4.45%)	⬇️
packages/core/util/index.ts	77.92% <0.00%> (ø)
...ments/src/SNPCoverageAdapter/SNPCoverageAdapter.ts	64.56% <0.00%> (+0.78%)	⬆️

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[cmdcolin]

maybe ill just go ahead with merge :) welcome to update if needed