btop: memory and disk color gradient following logical color

[Alexdelia]

fixing issue #934

---

updated color:

default view

large view

---

old `stylix` color:

default view

large view

---

default `btop` color:

default view

large view

---

I do not pretend to know what would be the best color, and I am very open to other idea.

Nonetheless, I believe that the current color are incorrect and misleading, and that those new colors are less confusing.

I hope that if you have better color arrangement, you will share them so we can get a better btop style support!

[Flameopathic]

note that your comment has two sections titled "old stylix color" when i believe you intend the second to be titled "default btop color"

the change itself looks good and is a much better match to the default.

[Alexdelia]

note that your comment has two sections titled "old stylix color" when i believe you intend the second to be titled "default btop color"

you're right, that's mb
fixed, thank you