[Doc] Use sphinx-tags to enable finding examples by tag

samples/python/README.rst

@@ -1,2 +1,7 @@
 Python Examples
 ===============
+
+.. seealso::
+
+    To find examples covering a specific topic, see the
+    :ref:`index of example tags <tagoverview>`.

samples/python/kinetics/blowers_masel.py

@@ -19,7 +19,8 @@ for elementary and Blower-Masel reactions. The second plot shows the activation
 change of a Blowers-Masel reaction with respect to the delta enthalpy of the reaction.
 
 Requires: cantera >= 2.6.0, matplotlib >= 2.0
-Keywords: kinetics, sensitivity analysis
+
+.. tags:: Python, kinetics, sensitivity analysis
 """
 
 import cantera as ct

samples/python/kinetics/custom_reactions.py

@@ -7,7 +7,8 @@ An example demonstrating how to use custom reaction objects.
 For benchmark purposes, an ignition test is run to compare simulation times.
 
 Requires: cantera >= 3.0.0
-Keywords: kinetics, benchmarking, user-defined model
+
+.. tags:: Python, kinetics, benchmarking, user-defined model
 """
 
 from timeit import default_timer

samples/python/kinetics/extract_submechanism.py

@@ -11,7 +11,8 @@ mechanism and the submechanism, which demonstrates that the submechanism
 contains all of the important species and reactions.
 
 Requires: cantera >= 2.6.0, matplotlib >= 2.0
-Keywords: kinetics, combustion, 1D flow, editing mechanisms, plotting
+
+.. tags:: Python, kinetics, combustion, 1D flow, editing mechanisms, plotting
 """
 
 from timeit import default_timer

samples/python/kinetics/mechanism_reduction.py

@@ -16,8 +16,10 @@ to see whether the reduced mechanisms with a certain number of species are able
 to adequately simulate the ignition delay problem.
 
 Requires: cantera >= 2.6.0, matplotlib >= 2.0
-Keywords: kinetics, combustion, reactor network, editing mechanisms, ignition delay,
-          plotting
+
+
+.. tags:: Python, kinetics, combustion, reactor network, editing mechanisms,
+          ignition delay, plotting
 """
 
 import cantera as ct

samples/python/kinetics/reaction_path.py

@@ -8,7 +8,8 @@ Graphviz can be obtained from https://www.graphviz.org/ or (possibly) installed
 using your operating system's package manager.
 
 Requires: cantera >= 2.5.0
-Keywords: kinetics, reaction path analysis, pollutant formation
+
+.. tags:: Python, kinetics, reaction path analysis, pollutant formation
 """
 
 from subprocess import run