Add comments to CoQui notebooks

Author: cnyeh

CoQui/01_dft_to_coqui_converter.ipynb

@@ -74,7 +74,7 @@
     "    <img src=\"./images/coqui_dft_converter.png\" alt=\"Workflow of input preparation for CoQuí\" width=\"60%\"> \n",
     "</figure>\n",
     "\n",
-    "Here we show how to convert the Quantum ESPRESSO (QE) outputs into a format recognized by CoQuí using the customized converter **`pw2coqui.x`** which is shipped with QE. \n",
+    "Here we show how to convert the Quantum ESPRESSO (QE) outputs into a format recognized by CoQuí using the [customized converter **`pw2coqui.x`**](https://github.com/AbInitioQHub/coqui/tree/examples/qe_converter). \n",
     "\n",
     "### ↔️ Running the QE converter \n",
     "Starting from a finished QE scf/nscf run, execute the converter: \n",
@@ -102,7 +102,8 @@
     "Together, these two pieces form the **complete CoQuí input**.\n",
     "\n",
     "> ⚠️ **Important**  \n",
-    "> Do **not** delete or move the {prefix}.save/ tree after conversion. CoQuí needs both the lightweight .coqui.h5 metadata file and the heavy orbital data in {prefix}.save/. Removing either will break subsequent steps."
+    "> Do **not** delete or move the {prefix}.save/ tree after conversion. CoQuí needs both the lightweight .coqui.h5 metadata file and the heavy orbital data in {prefix}.save/. Removing either will break subsequent steps.  \n",
+    "> ⏱️ **Note:** Due to the interest of time, we will **not** run the QE converter in the following tutorials. A pre-generated `.h5` file will be provided instead."
    ]
   },
   {