[Imporve] next.js pages 폴더의 pages안 파일명을 변경하라

[saseungmin]

• api 파일들은 *.api.ts, page 파일들은 *.page.tsx로 변경
• next.config.js 설정 추가

[vercel]

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[codecov]

Codecov Report

Merging #62 (da2e1c9) into main (de7d49f) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #62   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           27        27           
  Lines          163       163           
  Branches        13        13           
=========================================
  Hits           163       163           

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