refactor: update issue and PR templates for English localization

[tooooo1]

Summary

• Localized issue and PR templates from Korean to English.
• Simplified content for clarity and brevity.

Checks

Please check the following:

• I have written documents and tests, if needed.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 1a33255

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[codecov]

Codecov Report

Merging #10 (1a33255) into main (f83acaf) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #10   +/-   ##
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  Coverage   50.00%   50.00%           
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  Files           1        1           
  Lines          12       12           
  Branches        2        2           
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  Hits            6        6           
  Misses          5        5           
  Partials        1        1           

Components	Coverage Δ
@fepack/image	50.00% <ø> (ø)