Replace dark theme

[mstrasinskis]

Motivation

Update the dark theme.

Demo: https://qsgjb-riaaa-aaaaa-aaaga-cai.mstr-ingress.devenv.dfinity.network/ (+blue icons update)

Changes

1. Added new color that is needed for the new theme.
2. Copied CSS variables from the dark theme to the light theme to address any missing variables in the light theme. To not introduce any light theme changes after color replacement in the dark theme.
3. Replaced colors in the dark theme with new values. Color mapping was done using another branch as a color source, where designers verified the new new theme colors. Using this script and manual adjustment not covered by the script entries (mainly hex-to-RGB conversions).

Screenshots