docs: remove shim/proxy topics and fix docs links

And also change links from old documentation to docs sub-directory.

Fixes #444

Signed-off-by: bin liu <bin@hyper.sh>

docs/use-cases/Intel-GPU-passthrough-and-Kata.md

@@ -55,7 +55,7 @@ line.
 ## Install and configure Kata Containers
 
 To use this feature, you need Kata version 1.3.0 or above.
-Follow the [Kata Containers setup instructions](https://github.com/kata-containers/documentation/blob/master/install/README.md)
+Follow the [Kata Containers setup instructions](../install/README.md)
 to install the latest version of Kata.
 
 In order to pass a GPU to a Kata Container, you need to enable the `hotplug_vfio_on_root_bus`
@@ -82,12 +82,12 @@ CONFIG_DRM_I915_USERPTR=y
 ```
 
 Build the Kata Containers kernel with the previous config options, using the instructions
-described in [Building Kata Containers kernel](https://github.com/kata-containers/packaging/tree/master/kernel).
-For further details on building and installing guest kernels, see [the developer guide](https://github.com/kata-containers/documentation/blob/master/Developer-Guide.md#install-guest-kernel-images).
+described in [Building Kata Containers kernel](../../tools/packaging/kernel).
+For further details on building and installing guest kernels, see [the developer guide](../Developer-Guide.md#install-guest-kernel-images).
 
 There is an easy way to build a guest kernel that supports Intel GPU:
 ```
-## Build guest kernel with https://github.com/kata-containers/packaging/tree/master/kernel
+## Build guest kernel with ../../tools/packaging/kernel
 
 # Prepare (download guest kernel source, generate .config)
 $ ./build-kernel.sh -g intel -f setup

docs/use-cases/Nvidia-GPU-passthrough-and-Kata.md

@@ -72,7 +72,7 @@ Your host kernel needs to be booted with `intel_iommu=on` on the kernel command
 
 ## Install and configure Kata Containers
 To use non-large BARs devices (for example, Nvidia Tesla T4), you need Kata version 1.3.0 or above.
-Follow the [Kata Containers setup instructions](https://github.com/kata-containers/documentation/blob/master/install/README.md)
+Follow the [Kata Containers setup instructions](../install/README.md)
 to install the latest version of Kata.
 
 The following configuration in the Kata `configuration.toml` file as shown below can work:
@@ -131,13 +131,13 @@ It is worth checking that it is not enabled in your kernel configuration to prev
 
 
 Build the Kata Containers kernel with the previous config options,
-using the instructions described in [Building Kata Containers kernel](https://github.com/kata-containers/packaging/tree/master/kernel).
+using the instructions described in [Building Kata Containers kernel](../../tools/packaging/kernel).
 For further details on building and installing guest kernels,
-see [the developer guide](https://github.com/kata-containers/documentation/blob/master/Developer-Guide.md#install-guest-kernel-images).
+see [the developer guide](../Developer-Guide.md#install-guest-kernel-images).
 
 There is an easy way to build a guest kernel that supports Nvidia GPU:
 ```
-## Build guest kernel with https://github.com/kata-containers/packaging/tree/master/kernel
+## Build guest kernel with ../../tools/packaging/kernel
 
 # Prepare (download guest kernel source, generate .config)
 $ ./build-kernel.sh -v 4.19.86 -g nvidia -f setup

docs/use-cases/using-Intel-QAT-and-kata.md

@@ -194,9 +194,9 @@ $ ls -la /sys/bus/pci/drivers/vfio-pci
 
 This example automatically uses the latest Kata kernel supported by Kata. It
 follows the instructions from the
-[packaging kernel repository](https://github.com/kata-containers/packaging/tree/master/kernel)
+[packaging kernel repository](../../tools/packaging/kernel)
 and uses the latest Kata kernel
-[config](https://github.com/kata-containers/packaging/tree/master/kernel/configs).
+[config](../../tools/packaging/kernel/configs).
 There are some patches that must be installed as well, which the 
 `build-kernel.sh` script should automatically apply. If you are using a
 different kernel version, then you might need to manually apply them. Since

docs/use-cases/using-SPDK-vhostuser-and-kata.md

@@ -184,7 +184,7 @@ used for vhost-user devices.
 
 The base directory for vhost-user device is a configurable value,
 with the default being `/var/run/kata-containers/vhost-user`. It can be
-configured by parameter `vhost_user_store_path` in [Kata TOML configuration file](https://github.com/kata-containers/runtime/blob/master/README.md#configuration).
+configured by parameter `vhost_user_store_path` in [Kata TOML configuration file](../../src/runtime/README.md#configuration).
 
 Currently, the vhost-user storage device is not enabled by default, so
 the user should enable it explicitly inside the Kata TOML configuration

docs/use-cases/zun_kata.md

@@ -10,7 +10,7 @@ Currently, the instructions are based on the following links:
 
 - https://docs.openstack.org/zun/latest/admin/clear-containers.html
 
-- https://github.com/kata-containers/documentation/blob/master/install/ubuntu-installation-guide.md
+- ../install/ubuntu-installation-guide.md
 
 
 ## Install Git to use with DevStack
@@ -54,7 +54,7 @@ $ zun delete test
 
 ## Install Kata Containers
 
-Follow [these instructions](https://github.com/kata-containers/documentation/blob/master/install/ubuntu-installation-guide.md)
+Follow [these instructions](../install/ubuntu-installation-guide.md)
 to install the Kata Containers components.
 
 ## Update Docker with new Kata Containers runtime