Update time_series_plots fig test notebook

Update test notebook for `time_series_plots` figure module and confirm that the
module works in a production environment based on Python 3.13.

Author: douglatornell

notebooks/figures/research/TestTimeSeriesPlots.ipynb

@@ -54,7 +54,7 @@ def main():
 
 """
     for fn in Path(".").glob("*.ipynb"):
-        readme += f"* ## [{fn}]({url}/{fn})  \n    \n"
+        readme += f"* ## [{fn}]({url}/{fn})\n\n"
         readme += notebook_description(fn)
 
     license = f"""

notebooks/figures/research/make_readme.py

@@ -12,6 +12,10 @@
 #  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
+
+# SPDX-License-Identifier: Apache-2.0
+
+
 """Produce 4 figures that show the time series of surface:
 
   - nitrate and diatom concentrations