docstr: Load colors from yaml file
code: def from_yaml(self, filename):
      """Load colors from yaml file"""
      # Note: We assume that the contents of the config file are trusted
      # TODO: Change this file format to be plain yaml and use SafeLoader
      return yaml.load(open(filename), Loader=yaml.UnsafeLoader)
  
imports: from collections import OrderedDict
  from bokeh import palettes
  from IPython.core.display import HTML
  import yaml
  from chartify._core.options import options
  from chartify._core import colour
label_desc: Use image node_id 3 for calling the CustomColors obj's underlying member method code with example usage: obj.from_yaml(filename) and returns: yaml