Add Flag Icons and Improve Locale Switcher

[mouadlouhichi]

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[vercel]

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[blefnk]

Hello, Mouad! Thank you so much for your pull-request, for the first pull-request on this repository, heh! I'm going to release version 1.0.0 of the Relivator in the next few days, where I've prepared a lot of improvements and changes. So, if you don't mind, I'll manually add all your changes to the project to test everything with the new stuff.

By the way, I had to migrate to next-intl because of the strange behavior of redirects in next-international, so temporarily there will can be duplicates in the release version just in case. I also don't know do next-international has a thing like next-intl/link. Later I'll maybe try to combine next-intl and next-international as much as possible so that both will be the drop-in replacements at any time to improve DX and incremental adoption.

By the way, in addition to the contests for stargazers, there will also be separate contests for contributors.
I have noted you on the Project Credits & Contributors page. Thank you so much again!

[blefnk]

v1.0.0 🎉 Relivator Release