Default header and footer aren't styleable

[CendioOssman]

It's not possible to control the look of the default header or footer as they have no class to match on.

Description of problem
There are the classes "header" and "footer" in styles.style, but they do not seem to be used. I added some debug prints to the code, and this is the object generated for the default header:

[Paragraph(
'caseSensitive': 1
'encoding': 'utf8'
'text': '###Section###'
'frags': [ParaFrag(__tag__='para', bold=0, fontName='Mulish-Regular', fontSize=10.0, greek=0, italic=0, link=[], rise=0, text='###Section###', textColor=Color(0,0,0,1), us_lines=[])]
'style': <ParagraphStyle 'bodytext'>
'bulletText': None
'debug': 0
'width': 481.88976377952764
'_wrapWidths': [481.88976377952764, 481.88976377952764]
'_width_max': 70.06
'height': 12
'_splitLongWordCount': 0
'_hyphenations': 0
'blPara': ParaFrag(__tag__='para', ascent=10.05, bold=0, descent=-2.5, fontName='Mulish-Regular', fontSize=10.0, greek=0, italic=0, kind=0, lines=[(411.82976377952764, ['###Section###'])], link=[], rise=0, text='###Section###', textColor=Color(0,0,0,1), us_lines=[])
) #Paragraph]

As you can see, the style is the very generic bodytext, and not something specific.

What is the expected output? What do you see instead?

🖥 Versions
Python 3.6.12
rst2pdf 0.98
reportlab 3.6.1
sphinx 4.2.0

[lornajane]

Thanks for opening this issue, this would be very nice to have.