gh-97681: Remove Tools/demo/ directory (#97682)

Remove the Tools/demo/ directory which contained old demo scripts. A
copy can be found in the old-demos project:
https://github.com/gvanrossum/old-demos

Remove the following old demo scripts:

* beer.py
* eiffel.py
* hanoi.py
* life.py
* markov.py
* mcast.py
* queens.py
* redemo.py
* rpython.py
* rpythond.py
* sortvisu.py
* spreadsheet.py
* vector.py

Changes:

* Remove a reference to the redemo.py script in the regex howto
  documentation.
* Remove a reference to the removed Tools/demo/ directory in the
  curses documentation.
* Update PC/layout/ to remove the reference to Tools/demo/ directory.

1 files changed, 0 insertions, 94 deletions

diff --git a/Tools/demo/vector.py b/Tools/demo/vector.py
deleted file mode 100755
index 6df1f50a899..00000000000
--- a/Tools/demo/vector.py
+++ /dev/null
@@ -1,94 +0,0 @@
-#!/usr/bin/env python3
-
-"""
-A demonstration of classes and their special methods in Python.
-"""
-
-class Vec:
-    """A simple vector class.
-
-    Instances of the Vec class can be constructed from numbers
-
-    >>> a = Vec(1, 2, 3)
-    >>> b = Vec(3, 2, 1)
-
-    added
-    >>> a + b
-    Vec(4, 4, 4)
-
-    subtracted
-    >>> a - b
-    Vec(-2, 0, 2)
-
-    and multiplied by a scalar on the left
-    >>> 3.0 * a
-    Vec(3.0, 6.0, 9.0)
-
-    or on the right
-    >>> a * 3.0
-    Vec(3.0, 6.0, 9.0)
-
-    and dot product
-    >>> a.dot(b)
-    10
-
-    and printed in vector notation
-    >>> print(a)
-    <1 2 3>
-
-    """
-
-    def __init__(self, *v):
-        self.v = list(v)
-
-    @classmethod
-    def fromlist(cls, v):
-        if not isinstance(v, list):
-            raise TypeError
-        inst = cls()
-        inst.v = v
-        return inst
-
-    def __repr__(self):
-        args = ', '.join([repr(x) for x in self.v])
-        return f'{type(self).__name__}({args})'
-
-    def __str__(self):
-        components = ' '.join([str(x) for x in self.v])
-        return f'<{components}>'
-
-    def __len__(self):
-        return len(self.v)
-
-    def __getitem__(self, i):
-        return self.v[i]
-
-    def __add__(self, other):
-        "Element-wise addition"
-        v = [x + y for x, y in zip(self.v, other.v)]
-        return Vec.fromlist(v)
-
-    def __sub__(self, other):
-        "Element-wise subtraction"
-        v = [x - y for x, y in zip(self.v, other.v)]
-        return Vec.fromlist(v)
-
-    def __mul__(self, scalar):
-        "Multiply by scalar"
-        v = [x * scalar for x in self.v]
-        return Vec.fromlist(v)
-
-    __rmul__ = __mul__
-
-    def dot(self, other):
-        "Vector dot product"
-        if not isinstance(other, Vec):
-            raise TypeError
-        return sum(x_i * y_i for (x_i, y_i) in zip(self, other))
-
-
-def test():
-    import doctest
-    doctest.testmod()
-
-test()