Remove the discrete pulse library (#11277)

* Remove the discrete pulses library

* Fixes

qiskit/pulse/library/__init__.py

@@ -23,8 +23,7 @@
 This model provides the most flexibility to express arbitrary waveforms and allows
 a rapid prototyping of new control techniques. However, this model is typically memory
 inefficient and might be hard to scale to large-size quantum processors.
-Several waveform subclasses are defined by :ref:`waveforms`,
-but a user can also directly instantiate the :class:`~Waveform` class with ``samples`` argument
+A user can directly instantiate the :class:`~Waveform` class with ``samples`` argument
 which is usually a complex numpy array or any kind of array-like data.
 
 In contrast, the :class:`~SymbolicPulse` model only stores the function and its parameters
@@ -52,26 +51,6 @@
    ParametricPulse
 
 
-.. _waveforms:
-
-Waveform Pulse Representation
-=============================
-
-.. autofunction:: constant
-.. autofunction:: zero
-.. autofunction:: square
-.. autofunction:: sawtooth
-.. autofunction:: triangle
-.. autofunction:: cos
-.. autofunction:: sin
-.. autofunction:: gaussian
-.. autofunction:: gaussian_deriv
-.. autofunction:: sech
-.. autofunction:: sech_deriv
-.. autofunction:: gaussian_square
-.. autofunction:: drag
-
-
 .. _symbolic_pulses:
 
 Parametric Pulse Representation
@@ -97,21 +76,6 @@
 
 """
 
-from .discrete import (
-    constant,
-    zero,
-    square,
-    sawtooth,
-    triangle,
-    cos,
-    sin,
-    gaussian,
-    gaussian_deriv,
-    sech,
-    sech_deriv,
-    gaussian_square,
-    drag,
-)
 from .parametric_pulses import ParametricPulse
 from .symbolic_pulses import (
     SymbolicPulse,