Migrate from Travis CI to GitHub Actions and improve script quality

[Jintin]

Description
Overview
This PR modernizes the CI/CD pipeline and improves the overall code quality
of the project.

Changes

• CI/CD Migration: Removed the deprecated .travis.yml and replaced it with
  GitHub Actions.
• Static Analysis: Integrated ShellCheck into the CI workflow.
• Script Improvements: Added proper quoting to variables and updated read
  commands for better safety in aliasme.sh.
• Documentation: Updated README.md with the new GitHub Actions status badge.

Verification

• Existing tests (make test) are integrated into the new CI flow.
• ShellCheck linting passes for all scripts.