Don't run CI pipelines on frontend Readme file change

[paskal]

On an example of #1057, I found that we run CI pipelines when Readme file changes in the frontend directory, which doesn't make sense.

[codecov]

Codecov Report

Merging #1059 (b7f5256) into master (68aba33) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1059   +/-   ##
=======================================
  Coverage   44.18%   44.18%           
=======================================
  Files         126      126           
  Lines        2906     2906           
  Branches      653      617   -36     
=======================================
  Hits         1284     1284           
  Misses       1610     1610           
  Partials       12       12           

Impacted Files	Coverage Δ
frontend/app/common/static-store.ts	100.00% <ø> (ø)
frontend/app/common/types.ts	100.00% <ø> (ø)

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[github-actions]

size-limit report 📦

Path	Size
public/embed.mjs	2.23 KB (0%)
public/remark.mjs	65.31 KB (0%)
public/remark.css	9.4 KB (0%)
public/last-comments.mjs	30.08 KB (0%)
public/last-comments.css	5.07 KB (0%)
public/deleteme.mjs	9.79 KB (0%)
public/counter.mjs	601 B (0%)

[akellbl4]

I don't think we need to run it on any .md file in frontend folder and in backend as well.