Move Secureblue under the Fedora Atomic Desktop Entry

[jonah (Jonah Aragon)]

@saga

You could make a solid argument for moving the Atomic distros to the top but they are functionally different.

Prior discussion:

Immutable distributions clarification

Probably a good idea. We did discuss changing that category and highlighting its benefits more prominently previously, but didn’t really reach a consensus on how we should discuss them, with some arguments that they don’t really provide a huge benefit over traditional distributions in the first place… I don’t know how we feel about them yet.