Remove qiskit.org links from release notes (#605)

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

releasenotes/notes/0.5/add-primitives-support-31af39549b5e66e3.yaml

@@ -1,7 +1,7 @@
 ---
 prelude: >
     Qiskit Optimization 0.5 supports the new algorithms introduced in Qiskit Terra 0.22
-    which in turn rely on the `Qiskit Primitives <https://qiskit.org/documentation/apidoc/primitives.html>`_.
+    which in turn rely on the `Qiskit Primitives <https://docs.quantum.ibm.com/api/qiskit/primitives>`_.
     Qiskit Optimization 0.5 still supports the former algorithms based on :class:`qiskit.utils.QuantumInstance`,
     but they will be deprecated and then removed, along with the support here, in future releases.
 

releasenotes/notes/0.6/0.6-prelude-2740977b31d22583.yaml

@@ -13,7 +13,7 @@ prelude: >
     #. Otherwise, you need to migrate your code immediately. If you cannot do that, or want to continue using some
        of the features that were removed, you should pin your version of Qiskit Optimization to 0.5
 
-  You can check out the `migration guides <https://qiskit.org/ecosystem/optimization/migration/index.html>`_
+  You can check out the `migration guides <https://qiskit-community.github.io/qiskit-optimization/migration/index.html>`_
   for details on how to update your code.
 
   For more context on the changes around Qiskit Optimization and the other application projects as well as the algorithms

releasenotes/notes/0.6/switch-to-qiskit-algorithms-b0af38fe547bf5b5.yaml

@@ -1,7 +1,7 @@
 ---
 prelude: >
     Qiskit Optimization 0.6 switches from ``qiskit.algorithms`` of Qiskit
-    to `Qiskit Algorithms <https://qiskit.org/ecosystem/algorithms/>`_.
+    to `Qiskit Algorithms <https://qiskit-community.github.io/qiskit-algorithms/>`_.
     Qiskit Optimization 0.6 drops supports of the former algorithms based on
     ``qiskit.algorithms``, ``QuantumInstance``, and Opflow of Qiskit.
 
@@ -10,7 +10,7 @@ upgrade:
     The :class:`~.MinimumEigenOptimizer` class takes the primitives-based algorithms
     (:class:`qiskit_algorithms.SamplingMinimumEigensolver` and
     :class:`qiskit_algorithms.NumPyMinimumEigensolver`)
-    of `Qiskit Algorithms <https://qiskit.org/ecosystem/algorithms/>`_
+    of `Qiskit Algorithms <https://qiskit-community.github.io/qiskit-algorithms/>`_
     as ``min_eigen_solver`` argument.
     The supports of the former algorithms based on ``qiskit.algorithms`` and ``QuantumInstance``
     are removed.