feat(doom): Add vertical center

[polirritmico]

• Vertically center the Doom dashboard.
• Doom code refactor.
• Add the config.vertical_center option (defaults to false).
• Same average load time on my system.
• Fix Theme doom's content not vertically centered #354.

Is working for me without any problem in a lot of config scenarios, but I think it needs more testing.

Since this use the same load_packages code from hyper, but with a return, maybe we could move that into utils or something like theme/packages?

Regards

[glepnir]

how it looks like ?

[polirritmico]

how it looks like ?

Some screenshots:

• Without config:

• Regular font size:

• Really small font:

• Large font:

• With the week day header:

Any particular test case?

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Edit: Added context description

[polirritmico]

I've been using this code from my fork daily for two weeks without any issues.

The only question I have is whether the vertical_center option should be enabled by default or not. Since this doesn't center the preview, perhaps an opt-in approach would be better. What do you think @glepnir?