Dim theme

[snippsat]

To choose a Theme:
Users CP --> Edit Option --> Other Option --> Board Style
I have made a test with snippsat_default_midnight,that can be tested out.
Other Theme are not finish.
This Theme is based color around the blue Midnight theme.
A dark version is what i try next.

As see @metulburr so did i copy Default theme and start to work with that.
For me this was simpler to get stuff like sidebar Python icon working.
There are quite many color combination to think of when doing this,
a darker on may be easier