Update README and layout.html from 3.13 to 3.14 (#119539)

Co-authored-by: Nice Zombies <nineteendo19d0@gmail.com>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>

Doc/tools/templates/layout.html

@@ -61,7 +61,13 @@
    // since all the "active, built and not hidden" versions will be shown automatically.
    let versions = config.versions.active.concat([
        {
-           slug: "dev (3.13)",
+           slug: "dev (3.14)",
+           urls: {
+               documentation: "https://docs.python.org/3.14/",
+           }
+       },
+       {
+           slug: "pre (3.13)",
            urls: {
                documentation: "https://docs.python.org/3.13/",
            }

README.rst

@@ -136,7 +136,7 @@ What's New
 ----------
 
 We have a comprehensive overview of the changes in the `What's New in Python
-3.13 <https://docs.python.org/3.13/whatsnew/3.13.html>`_ document.  For a more
+3.14 <https://docs.python.org/3.14/whatsnew/3.14.html>`_ document.  For a more
 detailed change log, read `Misc/NEWS
 <https://github.com/python/cpython/tree/main/Misc/NEWS.d>`_, but a full
 accounting of changes can only be gleaned from the `commit history
@@ -149,7 +149,7 @@ entitled "Installing multiple versions".
 Documentation
 -------------
 
-`Documentation for Python 3.13 <https://docs.python.org/3.13/>`_ is online,
+`Documentation for Python 3.14 <https://docs.python.org/3.14/>`_ is online,
 updated daily.
 
 It can also be downloaded in many formats for faster access.  The documentation
@@ -200,15 +200,15 @@ intend to install multiple versions using the same prefix you must decide which
 version (if any) is your "primary" version.  Install that version using
 ``make install``.  Install all other versions using ``make altinstall``.
 
-For example, if you want to install Python 2.7, 3.6, and 3.13 with 3.13 being the
-primary version, you would execute ``make install`` in your 3.13 build directory
+For example, if you want to install Python 2.7, 3.6, and 3.14 with 3.14 being the
+primary version, you would execute ``make install`` in your 3.14 build directory
 and ``make altinstall`` in the others.
 
 
 Release Schedule
 ----------------
 
-See :pep:`719` for Python 3.13 release details.
+See `PEP 745 <https://peps.python.org/pep-0745/>`__ for Python 3.14 release details.
 
 
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