move fomantic target, update 'make help'

[silverwind]

I'd like to run webpack without fomantic in the prereqs so move it to the generate target.

I can see why @lunny added it to js/css but I think it's better for now to separate those to be able to individually call those steps.

[codecov-io]

Codecov Report

Merging #9945 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #9945      +/-   ##
==========================================
- Coverage   42.28%   42.27%   -0.02%     
==========================================
  Files         608      608              
  Lines       79393    79411      +18     
==========================================
- Hits        33574    33569       -5     
- Misses      41677    41701      +24     
+ Partials     4142     4141       -1

Impacted Files	Coverage Δ
modules/setting/repository.go	51.42% <ø> (ø)	⬆️
routers/repo/repo.go	30.02% <0%> (-0.22%)	⬇️
modules/git/commit_archive.go	0% <0%> (ø)	⬆️
models/unit.go	37.03% <0%> (-2.47%)	⬇️
services/pull/check.go	54.54% <0%> (-2.1%)	⬇️

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[techknowlogick]

Could you also add reference to make fomantic to docs where make css/js is mention?

[silverwind]

I plan to merge the css and js targets into one webpack target soon (depends on #9944), I guess doc updates for fomantic can be included there.