Add Wild Cherry theme (#168)

Found here: https://github.com/mashaal/wild-cherry#slack

data/themes.yml

@@ -205,3 +205,4 @@
 - { colors: '#065a8f,#267aaf,#7DB461,#FFFFFF,#2E3234,#FFFFFF,#7DB461,#215F8B', name: 'MetaFilter'}
 - { colors: '#000000,#000000,#355C7D,#ffffff,#222222,#ffffff,#b82601,#EFC000', name: 'newride.tech'}
 - { colors: '#2E3440,#3B4252,#88C0D0,#2E3440,#3B4252,#D8DEE9,#A3BE8C,#81A1C1', name: 'Nord'}
+- { colors: '#2B1F32,#FFB86C,#E15D97,#FFFFFF,#4A1386,#FFFFFF,#35BA66,#0AACC5', name: 'Wild Cherry'}