doc reorg and edits (#1112)

* doc reorg and edits

* Update wrapper.rst with changes from PR #1098

* Update docs/dockerhub.rst
Co-authored-by: Bartlomiej Wroblewski <bwroblewski10@gmail.com>

* Update docs/index.rst
Co-authored-by: Bartlomiej Wroblewski <bwroblewski10@gmail.com>

* Update docs/what-is-ck.rst
Co-authored-by: Bartlomiej Wroblewski <bwroblewski10@gmail.com>

* Update docs/what-is-ck.rst

Restored to 4 bullets, with additional text for wrapper.
Co-authored-by: Bartlomiej Wroblewski <bwroblewski10@gmail.com>

* Update docs/Contributors_Guide.rst
Co-authored-by: Lisa <lisajdelaney@gmail.com>

* Update API_Reference_Guide.rst

using sentence case for title

* updated index structure per Lisa

* separate docker hub and tutorial

---------
Co-authored-by: Bartlomiej Wroblewski <bwroblewski10@gmail.com>
Co-authored-by: Lisa <lisajdelaney@gmail.com>
Co-authored-by: Illia Silin <98187287+illsilin@users.noreply.github.com>

docs/dockerhub.rst

@@ -85,11 +85,9 @@ Where:
 
 To start a container from the image, use the ``docker start`` command::
 
-Let's take a look at the image naming, for example ``ck_ub20.04_rocm6.0``. The image specs are:
+    docker start <container_name>
 
-* ``ck`` - made for running Composable Kernel;
-* ``ub20.04`` - based on Ubuntu 20.04;
-* ``rocm6.0`` - ROCm platform version 6.0.
+Then use the docker exec command as shown above to start the bash shell. 
 
 Use the ``docker stop`` command to stop the container and restore the image to its initial state::
 

docs/tutorial_hello_world.rst

@@ -58,28 +58,9 @@ This tutorial is based on the use of docker images as explained in :ref:`docker-
 
 .. note::
 
-To make our lives easier we prepared
-`docker images <https://hub.docker.com/r/rocm/composable_kernel>`_ with all the necessary
-dependencies. Pick the right image and create a container. In this tutorial we use
-``rocm/composable_kernel:ck_ub20.04_rocm6.0`` image, it is based on Ubuntu 20.04 and
-ROCm v6.0.
-
-If your current folder is ``${HOME}``, start the docker container with::
-
-    docker run  \
-    -it  \
-    --privileged  \
-    --group-add sudo  \
-    -w /root/workspace  \
-    -v ${HOME}:/root/workspace  \
-    rocm/composable_kernel:ck_ub20.04_rocm6.0  \
-    /bin/bash
-
-If your current folder is different from ``${HOME}``, adjust the line ``-v ${HOME}:/root/workspace``
-to fit your folder structure.
-
-Inside the docker container current folder is ``~/workspace``, library path is
-``~/workspace/composable_kernel``, navigate to the library::
+   You can also `install ROCm <https://rocm.docs.amd.com/projects/install-on-linux/en/latest/>`_ on your system, clone the `Composable Kernel repository <https://github.com/ROCmSoftwarePlatform/composable_kernel.git>`_ on GitHub, and use that to build and run the examples using the commands described below.
+
+Both the docker container and GitHub repository include the Composable Kernel library. Navigate to the library::
 
     cd composable_kernel/
 

docs/wrapper.rst

@@ -18,7 +18,8 @@ Description
 
 
 The CK library provides a lightweight wrapper for more complex operations implemented in 
-the library.
+the library. It allows indexing of nested layouts using a simple interface 
+(avoiding complex descriptor transformations) and memory access (using Tensor).
 
 Example: