docs: Update snap install guide

As this repo is specific to the kata-containers 2.x, let's stop
mentioning / referring to the 1.x here, including how to setup and use
the snap package for 1.x.

Fixes: #1601

Signed-off-by: Fabiano Fidêncio <fidencio@redhat.com>

docs/install/snap-installation-guide.md

@@ -2,9 +2,6 @@
 
 * [Install Kata Containers](#install-kata-containers)
 * [Configure Kata Containers](#configure-kata-containers)
-* [Integration with non-compatible shim v2 Container Engines](#integration-with-non-compatible-shim-v2-container-engines)
-    * [Integration with Docker](#integration-with-docker)
-    * [Integration with Podman](#integration-with-podman)
 * [Integration with shim v2 Container Engines](#integration-with-shim-v2-container-engines)
 * [Remove Kata Containers snap package](#remove-kata-containers-snap-package)
 
@@ -14,20 +11,7 @@
 Kata Containers can be installed in any Linux distribution that supports
 [snapd](https://docs.snapcraft.io/installing-snapd).
 
-> NOTE: From Kata Containers 2.x, only the [Containerd Runtime V2 (Shim API)](https://github.com/containerd/containerd/tree/master/runtime/v2)
+Run the following command to install **Kata Containers**:
-> is supported, note that some container engines (`docker`, `podman`, etc) may not
-> be able to run Kata Containers 2.x.
-
-Kata Containers 1.x is released through the *stable* channel while Kata Containers
-2.x is available in the *candidate* channel.
-
-Run the following command to install **Kata Containers 1.x**:
-
-```sh
-$ sudo snap install kata-containers --classic
-```
-
-Run the following command to install **Kata Containers 2.x**:
 
 ```sh
 $ sudo snap install kata-containers --candidate --classic
@@ -46,55 +30,6 @@ $ sudo cp /snap/kata-containers/current/usr/share/defaults/kata-containers/confi
 $ $EDITOR /etc/kata-containers/configuration.toml
 ```
 
-## Integration with non-compatible shim v2 Container Engines
-
-At the time of writing this document, `docker` and `podman` **do not support Kata
-Containers 2.x, therefore Kata Containers 1.x must be used instead.**
-
-The path to the runtime provided by the Kata Containers 1.x snap package is
-`/snap/bin/kata-containers.runtime`, it should be used to run Kata Containers 1.x.
-
-### Integration with Docker
-
-`/etc/docker/daemon.json` is the configuration file for `docker`, use the
-following configuration to add a new runtime (`kata`) to `docker`.
-
-```json
-{
-  "runtimes": {
-    "kata": {
-      "path": "/snap/bin/kata-containers.runtime"
-    }
-  }
-}
-```
-
-Once the above configuration has been applied, use the
-following commands to restart `docker` and run Kata Containers 1.x.
-
-```sh
-$ sudo systemctl restart docker
-$ docker run -ti --runtime kata busybox sh
-```
-
-### Integration with Podman
-
-`/usr/share/containers/containers.conf` is the configuration file for `podman`,
-add the following configuration in the `[engine.runtimes]` section.
-
-```toml
-kata = [
-   "/snap/bin/kata-containers.runtime"
-]
-```
-
-Once the above configuration has been applied, use the following command to run
-Kata Containers 1.x with `podman`
-
-```sh
-$ sudo podman run -ti --runtime kata docker.io/library/busybox sh
-```
-
 ## Integration with shim v2 Container Engines
 
 The Container engine daemon (`cri-o`, `containerd`, etc) needs to be able to find the