build: Remove qctrl-visualizer from dev-dependencies (#240)

Co-authored-by: ABC <[email protected]>

Author: tachikoma-li

examples/creating-a-driven-control.ipynb

@@ -10,7 +10,9 @@
     "\n",
     "A driven control represents a continuous drive on the transition of a qubit with a tunable detuning. The Open Controls package allows you to generate driven controls that enact dynamically corrected gates. These dynamically corrected gates are able to achieve arbitrary rotations of the Bloch sphere, in a manner that is robust to dephasing and/or control noise. Dynamically corrected gates can be used as drop-in gate replacements to suppress errors in a quantum computation.\n",
     "\n",
-    "Q-CTRL Open Controls can be used to create a driven control from a library of well-known control schemes. Once created, it can be printed, plotted, and exported in CSV or JSON format for use on a quantum computer or any of [Q-CTRL's products](https://q-ctrl.com/products/)."
+    "Q-CTRL Open Controls can be used to create a driven control from a library of well-known control schemes. Once created, it can be printed, plotted, and exported in CSV or JSON format for use on a quantum computer or any of [Q-CTRL's products](https://q-ctrl.com/products/).\n",
+    "\n",
+    "To run this notebook, you need to install the [Q-CTRL Visualizer](https://docs.q-ctrl.com/boulder-opal/references/qctrl-visualizer/installation.html) first."
    ]
   },
   {
@@ -362,7 +364,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.10"
+   "version": "3.9.13"
   },
   "toc": {
    "base_numbering": 1,

examples/creating-a-dynamical-decoupling-sequence.ipynb

@@ -10,7 +10,9 @@
     "\n",
     "Dynamical decoupling is the use of fast pulses, often treated as instant ideal unitary operations, on a qubit to decouple it from its environment and improve its coherence time. The train of pulses is called a sequence, hence \"dynamical decoupling sequence\" (DDS). DDSs can be used to increase the coherence time of a qubit or they can be used as part of a characterization process to identify coherence time and/or noise spectra.\n",
     "\n",
-    "Q-CTRL Open Controls can be used to create a DDS from a library of well-known dynamical decoupling schemes. Once created, the DDS can be printed, plotted, and exported in CSV or JSON format for use on a quantum computer or any of [Q-CTRL's products](https://q-ctrl.com/products/)."
+    "Q-CTRL Open Controls can be used to create a DDS from a library of well-known dynamical decoupling schemes. Once created, the DDS can be printed, plotted, and exported in CSV or JSON format for use on a quantum computer or any of [Q-CTRL's products](https://q-ctrl.com/products/).\n",
+    "\n",
+    "To run this notebook, you need to install the [Q-CTRL Visualizer](https://docs.q-ctrl.com/boulder-opal/references/qctrl-visualizer/installation.html) first."
    ]
   },
   {
@@ -404,7 +406,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.10"
+   "version": "3.9.13"
   },
   "toc": {
    "base_numbering": 1,