Remove help from data/colors/dmilith-*

No need to duplicate it in each theme.
Mention author of sample color schemes
Add two sample color scheme Daniel R.

Thanks to Daniel R., a.k.a. reicheltd.
Note new sample color scheme in the ChangeLog

Thanks to Daniel R., a.k.a. reicheltd.
Merge branch 'update-color-schemes'

Add sample light color scheme.

Thanks to Daniel R., a.k.a. reicheltd.