Fix profile page CSS

[jolheiser]

Fixes #9980

Same as the usual fomantic changes, the styles were changed and no longer applied.
I chose the units based on a working version of Gitea and spying on the rendered styles on the page.

Somehow this style looks correct on my 1.11 instance (which is when fomantic was added)...so I'm not sure whether this needs a backport or not...

[lunny]

CI failed.

[codecov-io]

Codecov Report

Merging #10406 into master will decrease coverage by 0.1%.
The diff coverage is 15.83%.

@@            Coverage Diff             @@
##           master   #10406      +/-   ##
==========================================
- Coverage   43.79%   43.69%   -0.11%     
==========================================
  Files         586      586              
  Lines       81121    81351     +230     
==========================================
+ Hits        35529    35546      +17     
- Misses      41197    41405     +208     
- Partials     4395     4400       +5

Impacted Files	Coverage Δ
routers/api/v1/repo/pull.go	34.82% <0%> (-0.36%)	⬇️
routers/repo/editor.go	26.09% <0%> (-0.66%)	⬇️
modules/git/tree_entry.go	59.86% <0%> (-13.47%)	⬇️
services/pull/merge.go	49.45% <0%> (-0.99%)	⬇️
modules/git/error.go	48% <0%> (-6.55%)	⬇️
routers/utils/utils.go	72% <0%> (-28%)	⬇️
models/error.go	29.49% <0%> (-1.46%)	⬇️
routers/repo/pull.go	28.61% <0%> (-0.09%)	⬇️
modules/repofiles/temp_repo.go	58.54% <13.63%> (-3.57%)	⬇️
routers/repo/view.go	36.75% <30.15%> (-3.17%)	⬇️
... and 10 more

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