Point to cpython/Doc/requirements.txt instead of duplicating it

Let's also do some alpha-sorting and small cleanup.

Signed-off-by: Rodrigo Tobar <[email protected]>

Author: rtobar

requirements.txt

@@ -1,28 +1,18 @@
-docutils==0.21.2
+-r cpython/Doc/requirements.txt
+
+# Our own dependencies (alpha-sorted please)
 pip
-Pygments>=2.17.0
-PyICU
 polib
 pospell>=1.1
 potodo
 powrap>=1.0.2
-setuptools
-sphinx-intl>=2.3.0
 pre-commit
+Pygments>=2.17.0
+PyICU
+setuptools
 sphinx-autorun
 sphinxemoji
-sphinx-tabs==3.4.5
+sphinx-intl>=2.3.0
 sphinx-lint==0.7.0
+sphinx-tabs==3.4.5
 tabulate
-
-# from cpython/Doc/requirements.txt
-sphinx~=8.0.0
-
-blurb
-
-sphinxext-opengraph~=0.9.0
-sphinx-notfound-page~=1.0.0
-
-# The theme used by the documentation is stored separately, so we need
-# to install that as well.
-python-docs-theme>=2023.3.1,!=2023.7