fix broken link in getting_started.rst (Qiskit/qiskit-metapackage#748)

* closes Qiskit/qiskit-metapackage#747

* update next steps

* fix link to the_elements.rst

docs/getting_started.rst

@@ -228,7 +228,7 @@ experiment you ran.
 Step 6 : Visualize the Results
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-Qiskit provides `many visualizations <apidoc/visualization/visualization.html>`__,
+Qiskit provides `many visualizations <apidoc/visualization.html>`__,
 
 including the function ``plot_histogram``, to view your results.
 
@@ -251,6 +251,8 @@ Next Steps
 
 Now that you have learnt the basics, consider these learning resources:
 
-- `Notebook tutorials <https://nbviewer.jupyter.org/github/Qiskit/qiskit-tutorials/blob/master/qiskit/1_start_here.ipynb>`__
-- `Video tutorials <https://www.youtube.com/playlist?list=PLOFEBzvs-Vvp2xg9-POLJhQwtVktlYGbY>`__
-- `API References <apidoc/qiskit.html>`__
+- `About the Qiskit framework </the_elements.html>`__
+- `Qiskit documentation </apidoc/qiskit.html>`__
+- `Qiskit tutorials <https://nbviewer.jupyter.org/github/Qiskit/qiskit-tutorials/blob/master/qiskit/1_start_here.ipynb>`__
+- `Textbook: Learn Quantum Computing using Qiskit <https://community.qiskit.org/textbook/preface>`__
+- `Video series: Coding with Qiskit <https://www.youtube.com/playlist?list=PLOFEBzvs-Vvp2xg9-POLJhQwtVktlYGbY>`__