Also search "~/.local/share/fonts/" on Linux

[ManuelHu]

Prerequisites

• I have written a descriptive pull-request title
• I have verified that there are no overlapping pull-requests open
• I have verified that I am following matches the existing coding patterns and practice as demonstrated in the repository. These follow strict Stylecop rules 👮.
• I have provided test coverage for my change (where applicable)

Description

.local/share/fonts/ is another common location for user provided font files on "modern" Linux platforms, see https://wiki.archlinux.org/title/Fonts#Manual_installation

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #336 (ef19313) into main (3d93981) will decrease coverage by 1%.
The diff coverage is 0%.

@@          Coverage Diff          @@
##            main    #336   +/-   ##
=====================================
- Coverage     83%     83%   -1%     
=====================================
  Files        227     227           
  Lines      12858   12859    +1     
  Branches    1838    1838           
=====================================
  Hits       10772   10772           
- Misses      1651    1652    +1     
  Partials     435     435           

Flag	Coverage Δ
unittests	83% <0%> (-1%)	⬇️

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Impacted Files	Coverage Δ
src/SixLabors.Fonts/SystemFontCollection.cs	52% <0%> (-1%)	⬇️

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[JimBobSquarePants]

Lovely. Thanks!