fix typo in link color table

[dcechano]

This PR simply fixes a typo I noticed in the theme/color.rs file. It appears to attempt to link to a .svg but used .avg.

TODO

• Use cargo fmt
• Add necessary tests
• Update default config/theme in README (if applicable)
• Update man page at lsd/doc/lsd.md (if applicable)

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[codecov-commenter]

Codecov Report

Merging #932 (e662338) into master (ae1a2cd) will increase coverage by 0.03%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##           master     #932      +/-   ##
==========================================
+ Coverage   85.74%   85.78%   +0.03%     
==========================================
  Files          51       51              
  Lines        5003     5003              
==========================================
+ Hits         4290     4292       +2     
+ Misses        713      711       -2     

Files	Coverage Δ
src/theme/color.rs	76.92% <ø> (+0.85%)	⬆️

... and 3 files with indirect coverage changes

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[zwpaper]

Thanks for contributing!