✨ feat(remote_text shortcode): support line ranges

[welpo]

Summary

This PR adds support for line range selection in the remote_text shortcode. Users can now specify start and end line numbers when embedding text from remote or local files.

Related issue

Requested in #397.

Changes

• Added start and end parameters to the remote_text shortcode
• Updated the shortcode to slice the text content based on these parameters
• Updated documentation to explain the new functionality
• Added examples demonstrating the use of line range selection

Type of change

• Bug fix (fixes an issue without altering functionality)
• New feature (adds non-breaking functionality)
• Breaking change (alters existing functionality)
• UI/UX improvement (enhances user interface without altering functionality)
• Refactor (improves code quality without altering functionality)
• Documentation update
• Other (please describe below)

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Checklist

• I have verified the accessibility of my changes
• I have tested all possible scenarios for this change
• I have updated theme.toml with a sane default for the feature
• I have made corresponding changes to the documentation:
  • Updated config.toml comments
  • Updated theme.toml comments
  • Updated "Mastering tabi" post in English
  • (Optional) Updated "Mastering tabi" post in Spanish
  • (Optional) Updated "Mastering tabi" post in Catalan

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