fixing links: binder and second notebook (#651)

* fixing binder link

now it goes to the renamed index.ipynb file inside qiskit folder, instead of the misleading 404 :/

* fixing link to 2_the_ibmq_provider.ipynb

fixing link to the renamed second tutorial nb: the_ibmq_provider.ipynb

Author: omarcostahamido

README.md

@@ -10,7 +10,7 @@ In this repository, we've put together a collection of Jupyter notebooks aimed a
 
 The notebooks for these tutorials can be viewed here on GitHub. But for the full experience, you'll want to interact with them!
 
-The easiest way to do this is using [the Binder image](https://mybinder.org/v2/gh/qiskit/qiskit-tutorials/master?filepath=index.ipynb), which lets you use the notebooks via the web. This means that you don't need to download or install anything, but it also means that you should not insert any private information into the notebooks (such as your API key). We recommend as pointed out in [issue #231](https://github.com/Qiskit/qiskit-tutorials/issues/231) that after you are done using mybinder that you regenerate your token.
+The easiest way to do this is using [the Binder image](https://mybinder.org/v2/gh/qiskit/qiskit-tutorials/master?filepath=./qiskit/start_here.ipynb), which lets you use the notebooks via the web. This means that you don't need to download or install anything, but it also means that you should not insert any private information into the notebooks (such as your API key). We recommend as pointed out in [issue #231](https://github.com/Qiskit/qiskit-tutorials/issues/231) that after you are done using mybinder that you regenerate your token.
 
 Please refer to this [installation guide](INSTALL.md) for setting up Qiskit and the tutorials on your own machine (this is the recommended way).
 

qiskit/basics/1_getting_started_with_qiskit.ipynb

@@ -539,7 +539,7 @@
     "To faciliate access to real quantum computing hardware, we have provided a simple API interface.\n",
     "To access IBMQ devices, you'll need an API token. For the public IBM Q devices, you can generate an API token [here](https://quantumexperience.ng.bluemix.net/qx/account/advanced) (create an account if you don't already have one). For Q Network devices, login to the q-console, click your hub, group, and project, and expand \"Get Access\" to generate your API token and access url.\n",
     "\n",
-    "Our IBMQ provider lets you run your circuit on real devices or on our HPC simulator. Currently, this provider exists within Qiskit, and can be imported as shown below. For details on the provider, see [The IBMQ Provider](the_ibmq_provider.ipynb)."
+    "Our IBMQ provider lets you run your circuit on real devices or on our HPC simulator. Currently, this provider exists within Qiskit, and can be imported as shown below. For details on the provider, see [The IBMQ Provider](2_the_ibmq_provider.ipynb)."
    ]
   },
   {