Improve script with optional features

[i99dev]

Summary

• add options to skip individual install or symlink steps
• show help message describing new flags
• document the new --help output in README
• keep script executable

Testing

• bash -n be_free.sh
• bash be_free.sh --help | head

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https://chatgpt.com/codex/tasks/task_e_684b1cba4630833191932341d55093fe

[github-actions]

sh-checker report

To get the full details, please check in the job output.

shellcheck errors

'shellcheck -e SC1004' returned error 1 finding the following syntactical issues:

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In be_free.sh line 87:
    curl -L https://code.visualstudio.com/sha/download?build=stable&os=darwin-universal -o /tmp/vscode.zip
                                                                   ^-- SC1132 (warning): This & terminates the command. Escape it or add space after & to silence.
                                                                    ^-- SC2037 (error): To assign the output of a command, use var=$(cmd) .

For more information:
  https://www.shellcheck.net/wiki/SC2037 -- To assign the output of a command...
  https://www.shellcheck.net/wiki/SC1132 -- This & terminates the command. Es...
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You can address the above issues in one of three ways:
1. Manually correct the issue in the offending shell script;
2. Disable specific issues by adding the comment:
  # shellcheck disable=NNNN
above the line that contains the issue, where NNNN is the error code;
3. Add '-e NNNN' to the SHELLCHECK_OPTS setting in your .yml action file.

shfmt errors

shfmt checking is disabled.