Update README.md

Author: nonhermitian

README.md

@@ -1,29 +1,53 @@
-<img src="images/qiskit_header.png" >
-
 # Qiskit Tutorials
 
 [![License](https://img.shields.io/github/license/Qiskit/qiskit-tutorials.svg?style=popout-square)](https://opensource.org/licenses/Apache-2.0)
 
-Welcome to the [Qiskit](https://www.qiskit.org/) Tutorials!
+These tutorials are rendered as part of the:
 
-In this repository, we've put together a collection of Jupyter notebooks aimed at teaching people who want to use Qiskit for writing quantum computing programs, and executing them on one of several backends (online quantum processors, online simulators, and local simulators). The online quantum processors are the [IBM Quantum](https://quantum-computing.ibm.com) systems.
+### [>>Qiskit Documentation<<](Qiskit documentation](https://qiskit.org/documentation/)
 
-For our community-contributed tutorials, please check out the [qiskit-community-tutorials](https://github.com/Qiskit/qiskit-community-tutorials) repository.
 
-## Installation
 
-The notebooks for these tutorials can be viewed here on GitHub.  However,  for the
-full experience, you will want to interact with them.  The easiest way to do this
-is by logging into the [IBM Quantum Experience](https://quantum-computing.ibm.com/), 
-which lets you use Jupyter notebooks, including these tutorials, via the web.
+## Contents
 
-Please refer to this [installation guide](INSTALL.md) for setting up Qiskit and
-the tutorials on your own machine (this is the recommended way).
+Welcome to the [Qiskit](https://www.qiskit.org/) Tutorials!
 
-## Contents
+In this repository, we've put together a collection of Jupyter notebooks aimed at teaching people who want to use Qiskit for writing quantum computing programs, and executing them on one of several backends (online quantum processors, online simulators, and local simulators). The online quantum processors are the [IBM Quantum](https://quantum-computing.ibm.com) systems.
 
-To start seeing how Qiskit works, load up the [start_here.ipynb](start_here.ipynb) notebook
-or view the tutorials in the [Qiskit documentation](https://qiskit.org/documentation/).
+For our community-contributed tutorials, please check out the [qiskit-community-tutorials](https://github.com/Qiskit/qiskit-community-tutorials) repository.
+
+## Contribution Guidelines
+
+If you'd like to contribute to Qiskit Tutorials, please take a look at our [contribution guidelines](.github/CONTRIBUTING.md). This project adheres to Qiskit's [code of conduct](.github/CODE_OF_CONDUCT.md). By participating, you are expect to uphold to this code.
+
+### Tutorial limitations
+Because the tutorials are executed as part of the build process, and eventually turned into RST documentation, there are several limitations to be aware of:
+
+  1. There is currently a 3min/cell execution time limit.  Cells that go over this limit will raise an exception.
+
+  2. It is important to maintain stict header compliance.  All notebooks should start with, and contain only one, top level (h1) header:
+  
+      ```
+      # I am a top level header
+      ```
+     
+     Additionally, the nesting of headers should make sense:
+     
+      ```
+      # I am a top level header
+      
+      ## I am a secondary header
+      
+      ### I am a tertiary header
+      
+      ## I am another secondary header
+      
+      ## I am another secondary header
+      ```
+
+### Adding a gallery image
+
+To add a gallery image to a notebook, select a cell with an output image and add `nbsphinx-thumbnail` as a cell tag.  To see the cell tags go to: `View -> Cell Toolbar -> Tags` in the notebook menu.  Adding gallery images from images not generated inside of the notebooks themselves should be avoided if possible as this gets messy in the present build system.
 
 ## Building documentation
 
@@ -35,17 +59,9 @@ pip install sphinx-rtd-theme
 pip install nbsphinx
 ```
 
-## Contribution Guidelines
-
-If you'd like to contribute to Qiskit IQX Tutorials, please take a look at our [contribution guidelines](.github/CONTRIBUTING.md). This project adheres to Qiskit's [code of conduct](.github/CODE_OF_CONDUCT.md). By participating, you are expect to uphold to this code.
-
-We use [GitHub issues](https://github.com/Qiskit/qiskit-iqx-tutorials/issues) for tracking requests and bugs. Please use our [Slack](https://qiskit.slack.com) for discussion and simple questions. To join our Slack community, use the
-[link](https://join.slack.com/t/qiskit/shared_invite/enQtODQ2NTIyOTgwMTQ3LTI0NzM2NzkzZjJhNDgzZjY5MTQzNDY3MGNiZGQzNTNkZTE4Nzg1MjMwMmFjY2UwZTgyNDlmYWQwYmZjMjE1ZTM).
-For questions that are more suited for a forum, we use the Qiskit tag in the [Stack Exchange](https://quantumcomputing.stackexchange.com/questions/tagged/qiskit).
-
 ## Authors and Citation
 
-Qiskit IQX Tutorials is the work of [many people](https://github.com/Qiskit/qiskit-iqx-tutorials/graphs/contributors) who contribute to the project at different levels. If you use Qiskit, please cite as per the included [BibTeX
+Qiskit Tutorials is the work of [many people](https://github.com/Qiskit/qiskit-tutorials/graphs/contributors) who contribute to the project at different levels. If you use Qiskit, please cite as per the included [BibTeX
 file](https://github.com/Qiskit/qiskit/blob/master/Qiskit.bib).
 
 ## License