Add Pastel theme (#208)

data/themes.yml

@@ -54,6 +54,7 @@
 - { colors: '#303E4D,#2C3849,#6698C8,#FFFFFF,#4A5664,#FFFFFF,#94E864,#78AF8F', name: 'Ochin' }
 - { colors: '#057fa5,#034F75,#ffffff,#057fa5,#034F75,#FFFFFF,#99D04A,#ff9800', name: 'OpenData.cz' }
 - { colors: '#F68D29,#F99A3F,#F99A3F,#FFFFFF,#ED8624,#FFFFFF,#FFFFFF,#F9A55A', name: 'osTicket' }
+- { colors: '#b19cd9,#89cff0,#FEC8D8,#FFFFFF,#89cff0,#FFFFFF,#FFFFFF,#8F6DB0', name: 'Pastel' }
 - { colors: '#C10048,#920A3D,#2E0002,#FFFFFF,#610A29,#FFFFFF,#FFFFFF,#610A29', name: 'Polygon' }
 - { colors: '#1F2036,#7986CB,#FE528C,#FFFFFF,#606BA2,#FFFFFF,#2DEBAE,#FE528C', name: 'Polymer' }
 - { colors: '#F6F6F6,#EEEEEE,#FA3649,#FFFFFF,#FFFFFF,#000000,#60D156,#FA3649', name: 'PouchDB' }