README: Update Screenshots and Badges in ZH

[6543]

close #7986

[6543]

@techknowlogick i use one old pic: ![Pull Request View](https://image.ibb.co/e02dSb/6.png) so there is no empty table feald ... if you like you can make a new one / upload this to dl.gitea.io too ?

[codecov-io]

Codecov Report

Merging #8813 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #8813      +/-   ##
==========================================
+ Coverage   41.25%   41.26%   +0.01%     
==========================================
  Files         543      543              
  Lines       69767    69767              
==========================================
+ Hits        28779    28791      +12     
+ Misses      37300    37285      -15     
- Partials     3688     3691       +3

Impacted Files	Coverage Δ
modules/migrations/migrate.go	21.22% <0%> (-1.68%)	⬇️
modules/migrations/gitea.go	10.27% <0%> (-1.5%)	⬇️
models/repo.go	48.57% <0%> (-0.06%)	⬇️
models/gpg_key.go	55.59% <0%> (+0.55%)	⬆️
modules/log/event.go	65.64% <0%> (+1.02%)	⬆️
models/error.go	32.98% <0%> (+1.23%)	⬆️
models/repo_indexer.go	70.18% <0%> (+1.81%)	⬆️
modules/task/migrate.go	28.2% <0%> (+3.84%)	⬆️
modules/indexer/indexer.go	55.26% <0%> (+10.52%)	⬆️

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[guillep2k]

I guess it's OK to hotlink Github for this...

https://raw.githubusercontent.com/go-gitea/gitea/master/public/img/gitea-192.png