Prioritize "readme.md"

[wewark]

Fixes #5678
Check all the files in the home dir:

• If a file matches exactly "readme.md", prioritize it over the others,
• Otherwise, choose any file that matches "readme.md" but not strictly

[codecov-io]

Codecov Report

Merging #5691 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #5691      +/-   ##
==========================================
+ Coverage   37.76%   37.77%   +0.01%     
==========================================
  Files         325      325              
  Lines       47650    47661      +11     
==========================================
+ Hits        17994    18005      +11     
  Misses      27062    27062              
  Partials     2594     2594

Impacted Files	Coverage Δ
routers/repo/view.go	47.3% <100%> (+1.29%)	⬆️
modules/markup/markup.go	69.35% <100%> (+1.55%)	⬆️

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