docstr: create HTML Head
  
  Args:
      style (str): CSS Style
  Returns: HTML String
code: def create_head(style: str):
      """
      create HTML Head
  
      Args:
          style (str): CSS Style
      Returns: HTML String
      """
      doc = Doc()
      with doc.tag("head"):
          with doc.tag("title"):
              doc.text("SAP Explainable AI Report")
          doc.stag(
              "meta",
              charset="utf-8",
              name="viewport",
              content="width=device-width, initial-scale=1",
          )
          with doc.tag("style"):
              doc.asis(style)
      return doc.getvalue()
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import datetime
  from yattag import Doc, indent
label_desc: Use image node_id 23 for calling the CustomHtml obj's underlying member method code with example usage: obj.create_head(style) and returns: doc