started updating doc

docs/source/accessing_datasets.rst

-Creating and accessing DataSets
-===============================
+Accessing DataSets
+==================
+
+.. container:: toggle
+
+    .. container:: header
+
+       .. container:: btn btn-info
+
+          main.cpp (show/hide)
+
+    .. literalinclude:: ../../examples/03_datasets/main.cpp
+       :language: cpp

docs/source/accessing_events.rst

-Creating and accessing events
-=============================
+Accessing Events
+================
+
+.. container:: toggle
+
+    .. container:: header
+
+       .. container:: btn btn-info
+
+          main.cpp (show/hide)
+
+    .. literalinclude:: ../../examples/06_events/main.cpp
+       :language: cpp
+
+    
+.. container:: toggle
+
+    .. container:: header
+
+       .. container:: btn btn-info
+
+          main.cpp (show/hide)
+
+    .. literalinclude:: ../../examples/07_events_from_datasets/main.cpp
+       :language: cpp

docs/source/accessing_runs.rst

-Creating and accessing Runs
-===========================
+Accessing Runs
+==============
+
+.. container:: toggle
+
+    .. container:: header
+
+       .. container:: btn btn-info
+
+          main.cpp (show/hide)
+
+    .. literalinclude:: ../../examples/04_runs/main.cpp
+       :language: cpp

docs/source/accessing_subruns.rst

-Creating and accessing SubRuns
-==============================
+Accessing SubRuns
+=================
+
+.. container:: toggle
+
+    .. container:: header
+
+       .. container:: btn btn-info
+
+          main.cpp (show/hide)
+
+    .. literalinclude:: ../../examples/05_subruns/main.cpp
+       :language: cpp