Implement naive Snow Storm palette

[Slotos]

This basically reverts first seven palette colors' order, which is what "bright to dark" style recommends. Bright color used for comments is blended by hand and should be critiqued.

Dark to bright approach is also possible, by swapping nord0_gui and nord2_gui in light palette. However, the outcome looks incomplete and definitely needs additional work to be viable.

Note: the colors might be hard to read on thin fonts
I.e. Cascadia Mono Pl Light takes some adjusting while Cascadia Mono Pl looks good outright

Additionally, a separate commit provides explicit TabLine[Fill] background color values.

Screenshot

[Slotos]

Second iteration screenshots.

Dark

Normal mode

Visual mode

Command mode

Replace mode

Light

Normal mode

Visual mode

Command mode

Replace mode

[shaunsingh]

Looks good to me! Anything else you need to add on the PR, or is it good to merge?

[Slotos]

That's pretty much it. Any further iterations can happen separately when needed.