Allow http.server to emit HTML 5

[uranusjr]

BPO	46738
Nosy	@JelleZijlstra, @uranusjr
Superseder	bpo-46736: Generate HTML 5 with SimpleHTTPRequestHandler.list_directory

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2022-02-15.19:43:17.167>
created_at = <Date 2022-02-13.12:57:58.942>
labels = ['library']
title = 'Allow http.server to emit HTML 5'
updated_at = <Date 2022-02-16.02:51:23.260>
user = 'https://github.com/uranusjr'

bugs.python.org fields:

activity = <Date 2022-02-16.02:51:23.260>
actor = 'martin.panter'
assignee = 'none'
closed = True
closed_date = <Date 2022-02-15.19:43:17.167>
closer = 'JelleZijlstra'
components = ['Library (Lib)']
creation = <Date 2022-02-13.12:57:58.942>
creator = 'uranusjr'
dependencies = []
files = []
hgrepos = []
issue_num = 46738
keywords = []
message_count = 2.0
messages = ['413179', '413301']
nosy_count = 2.0
nosy_names = ['JelleZijlstra', 'uranusjr']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '46736'
type = None
url = 'https://bugs.python.org/issue46738'
versions = []

[uranusjr]

Currently, a directory listing page emitted by http.parser uses the HTML 4.01 doctype. While this is perfectly fine for most uses, the server tool is sometimes used for things that require another doctype; PEP-5031, for example, requires an HTML 5 document.

From what I can tell, http.parser is already emitting a valid HTML 5 page, so it should be possible to simply change the doctype declaration. Or, if backward compatibility is paramount, this could live behind a --doctype flag as well. If we go the latter route, more doctypes (e.g. XHTML) could potentially be supported as well with minimal modification.

[JelleZijlstra]

Looks like this is a duplicate of bpo-46736. Seems like a good idea though!