Fix broken "Make Your Own" link

looks like the page moved under the tinker section

I also validated and updated the other references to the `ublue.it` domain to `universal-blue.org`

README.md

@@ -4,11 +4,11 @@
 
 This is a constantly updating template repository for creating [a native container image](https://fedoraproject.org/wiki/Changes/OstreeNativeContainerStable) designed to be customized however you want. GitHub will build your image for you, and then host it for you on [ghcr.io](https://github.com/features/packages). You then just tell your computer to boot off of that image. GitHub keeps 90 days worth image backups for you, thanks Microsoft!
 
-For more info, check out the [uBlue homepage](https://ublue.it/) and the [main uBlue repo](https://github.com/ublue-os/main/)
+For more info, check out the [uBlue homepage](https://universal-blue.org/) and the [main uBlue repo](https://github.com/ublue-os/main/)
 
 ## Getting started
 
-See the [Make Your Own -page in the documentation](https://ublue.it/making-your-own/) for quick setup instructions for setting up your own repository based on this template.
+See the [Make Your Own -page in the documentation](https://universal-blue.org/tinker/make-your-own/) for quick setup instructions for setting up your own repository based on this template.
 
 Don't worry, it only requires some basic knowledge about using the terminal and git.
 
@@ -22,7 +22,7 @@ Don't worry, it only requires some basic knowledge about using the terminal and
 
 The easiest way to start customizing is by looking at and modifying `recipe.yml`. It's documented using comments and should be pretty easy to understand.
 
-For the base-image field, you can use any other native container image. You will get all the features of that image, plus the ones added here! Check out the [uBlue images list](https://ublue.it/images/) to decide what to use!
+For the base-image field, you can use any other native container image. You will get all the features of that image, plus the ones added here! Check out the [uBlue images list](https://universal-blue.org/images/) to decide what to use!
 
 If you want to add custom configuration files, you can just add them in the `usr/etc/` directory, which is the official OSTree "configuration template" directory. If you need to add other directories, you can look at the Containerfile to see how it's done. Writing to `/etc` or `/var` in Fedora's immutable OSTree-based distros *isn't supported* and will not work, as those are user-managed locations!