use workspaces

[akellbl4]

A part of #1409

• adds pnpm workspaces
• moves frontend to frontend/apps/remark42 (99% of changes)
• updates ci jobs

Note: size-limit is crashing because code was moved and it expects it in the same place (when runs check on master)

[codecov]

Codecov Report

Merging #1417 (c95e8e9) into master (fddf1e2) will increase coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1417      +/-   ##
==========================================
+ Coverage   58.00%   58.12%   +0.12%     
==========================================
  Files         131      131              
  Lines        2900     2909       +9     
  Branches      699      743      +44     
==========================================
+ Hits         1682     1691       +9     
+ Misses       1214     1087     -127     
- Partials        4      131     +127     

Impacted Files	Coverage Δ
...tend/app/components/auth/components/oauth.utils.ts
frontend/app/store/thread/utils.ts
frontend/app/components/button/index.ts
frontend/app/components/button/button.tsx
frontend/app/store/comments/reducers.ts
frontend/app/components/tooltip/tooltip.tsx
frontend/app/common/api.getLastComments.ts
frontend/app/components/auth/components/button.tsx
frontend/app/utils/set-dom-props.ts
frontend/app/utils/debounce.ts
... and 252 more

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[coveralls]

Pull Request Test Coverage Report for Build 2665445563

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 84.085%

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Totals
Change from base Build 2665241525:	0.03%
Covered Lines:	5743
Relevant Lines:	6830

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💛 - Coveralls

[paskal]

LGTM, except for the fact that this change can't go without a single .md file change. Something should be altered in the frontend dev documentation and maybe a Readme file.

[paskal]

Also please don't merge before #1422, I would like to rebase with newer Dockerfile.

[paskal]

To be precise, I want to see edits in https://github.com/umputun/remark42/blob/master/site/src/docs/contributing/development/frontend/index.md.