github-corners config priorty causes crash

I dont have `"repository"` in my `package.json` and did **not** defined `github-corners` option. But the updated code expects one of them to be there:

```
npx -y markdown-to-html-cli -s CHANGELOG.md --output ./CHANGELOG.html  ✔
/node_modules/markdown-to-html-cli/lib/utils.js:22
options['github-corners'] = opts['github-corners'] ?? options['github-corners'] ?? (typeof pgkData.repository === 'string' ? pgkData.repository : pgkData.repository.url);
^
TypeError: Cannot read properties of undefined (reading 'url')
```

This was introduced with https://github.com/jaywcjlove/markdown-to-html-cli/commit/63a9786d6b3baac9b8ee2e123319d6a8d12db517#diff-852d90245bbe147114049b7940720369a5dd1c564e5d1ab29b1bf8eae193cef3L28-R25

By there removal of `if(pgkData.repository &` so now it just expects repository to be there

Start with lib/utils.js around line 22 and reproduce the failure using the npx markdown-to-html-cli command shown in the issue. Compare the current logic with commit 63a9786d6b3baac9b8ee2e123319d6a8d12db517. Done means the command works when package.json has no repository and no github-corners option.

Written by the indexing model from the issue text.