docstr: create HTML Body Navigator
  
  Args:
      nav (list): Nav Content
  Returns: HTML String
code: def create_body_nav(nav: list):
      """
      create HTML Body Navigator
  
      Args:
          nav (list): Nav Content
      Returns: HTML String
      """
      # -- Create HTML Body Section Nav --
      doc = Doc()
      with doc.tag("nav"):
          for i in nav:
              doc.asis(i)
      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 25 for calling the CustomHtml obj's underlying member method code with example usage: obj.create_body_nav(nav) and returns: doc