Make all off-site links open in a new tab

[donheshanthaka]

Fixes: #563

Thanks for contributing to the Hacktoberfest Swag List 😃 🎉! Before submitting your pull request, please check off as many of the items below as you can:

1. I have read the Contributing.md file and formatted this PR correctly
2. I'm not adding a company from the blocklist
3. I make sure to fix things promptly if an error or suggestion comes up

Thanks and Happy Hacktoberfest! 🎉
Tagging @crweiner to take a look. 👀

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[crweiner]

Hello @donheshanthaka! Thank you for your PR to update the off-site links to open in a new tab!

It appears like you're using an old version of the Swag List; the one from the end of 2021. Can you please rebase or submit a new PR with this fix applied to the current MkDocs version of the Swag List? Thank you!

[crweiner]

This has now been added in PR #573