Prepare textreuse 1.0.2

[YaoxiangLi]

Summary

• prepare version 1.0.2 and refresh release metadata
• replace inactive Travis CI and AppVeyor configurations with GitHub Actions R-CMD-check and coverage workflows
• update external documentation links to secure, current destinations
• regenerate package documentation and the README

Impact

The package behavior remains compatible while locality-sensitive hashing
helpers avoid warnings from current dplyr and tidyr releases. New GitHub
Actions coverage provides active cross-platform validation for future changes.

Validation

• installed package test suite passed
• full R CMD check --as-cran textreuse_1.0.2.tar.gz passed with 0 errors, 0 warnings, and 0 notes, including PDF and HTML manuals
• CRAN reverse strong dependency lookup returned none
• workflow YAML parsed successfully
• release tarball audit found no private or repository-only files