skpkg: migrate large doc/manual files

[zmx27]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.23%. Comparing base (b397292) to head (c7b2f71).
Report is 3 commits behind head on migration.

Additional details and impacted files

@@            Coverage Diff             @@
##           migration     #205   +/-   ##
==========================================
  Coverage      97.23%   97.23%           
==========================================
  Files             20       20           
  Lines            903      903           
==========================================
  Hits             878      878           
  Misses            25       25           

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[zmx27]

@sbillinge I was able to compress morph_ex1.png using a tool called optipng, pdfmorph.pdf using Ghostscript, and nacl_example.agr using gzip. However, I couldn't figure out how to compress nacl_example.xcf. Instead, I deleted the file and replaced it with nacl_example.png by opening the file in GIMP and exporting it as a PNG file. Ready for review.

If this is okay, please let me know of any other changes I should make. If not, please make a PR from the migration branch to main in upstream after this is merged and close #197!

[sbillinge]

Thanks so much, this is great!