Allow display of LFS stored Readme.md on directory page (#6073)

[zeripath]

Allows display of Git LFS stored Readme.md files.

Also fixes bug with display of text files stored with LFS which are >1Kb.

Fix #6073

[codecov-io]

Codecov Report

Merging #6099 into master will decrease coverage by 0.03%.
The diff coverage is 16.04%.

@@            Coverage Diff             @@
##           master    #6099      +/-   ##
==========================================
- Coverage   38.86%   38.82%   -0.04%     
==========================================
  Files         354      354              
  Lines       50115    50171      +56     
==========================================
+ Hits        19475    19481       +6     
- Misses      27822    27869      +47     
- Partials     2818     2821       +3

Impacted Files	Coverage Δ
routers/repo/view.go	42.07% <16.04%> (-3.62%)	⬇️
modules/avatar/avatar.go	81.25% <0%> (-18.75%)	⬇️
models/unit.go	0% <0%> (-14.29%)	⬇️

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