Write mdx documentation for ProgressBar component

[Dogdriip]

Self Checklist

• I wrote a PR title in English.
• I added an appropriate label to the PR.
• I wrote a commit message in English.
• I wrote a commit message according to the Conventional Commits specification.
• I added the appropriate changeset for the changes.
• [ ] [Component] I wrote a unit test about the implementation.
• [ ] [Component] I wrote a storybook document about the implementation.
• [ ] [Component] I tested the implementation in various browsers.
  • Windows: Chrome, Edge, (Optional) Firefox
  • macOS: Chrome, Edge, Safari, (Optional) Firefox
• [New Component] I added my username to the correct directory in the CODEOWNERS file.

Related Issue

Closes #1034

Summary

• ProgressBar 컴포넌트에 대한 mdx documentation을 작성합니다.

Details

• Storybook preview 확인 후 첨삭 부탁드립니다 🙏

Breaking change or not (Yes/No)

No.

References

[changeset-bot]

⚠️ No Changeset found

Latest commit: 26e5541

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[codecov]

Codecov Report

Base: 71.19% // Head: 71.20% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (26e5541) compared to base (fe9640b).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff            @@
##           next-v1    #1035   +/-   ##
========================================
  Coverage    71.19%   71.20%           
========================================
  Files          208      208           
  Lines         2979     2980    +1     
  Branches       822      822           
========================================
+ Hits          2121     2122    +1     
  Misses         739      739           
  Partials       119      119           

Impacted Files	Coverage Δ
...r-react/src/components/ProgressBar/ProgressBar.tsx	100.00% <100.00%> (ø)

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[github-actions]

Chromatic Report

🚀 Congratulations! Your build was successful!

• Storybook Preview
• Chromatic Build

[Dogdriip]

😢 채워주실 내용이 있다면 브랜치로 직접 푸시해 주시거나 코멘트 달아주시면 감사하겠습니다!

[sungik-choi]

추후 크로마틱의 UI 스냅샷 기능을 제대로 사용하게 될 경우, 이 함수는 매 빌드마다 일정하지 않은 값을 반환하게 되므로 스냅샷 기능을 제대로 사용할 수 없게 됩니다. 0으로 초기값을 세팅해도 괜찮을 거 같아요! (#1000)