docs: fix static check errors

Somehow we are not running static checks for a long time.
And that ended up with a lot for errors.

* Ensure debug options are valid is dropped
* fix snap links
* drop extra CONTRIBUTING.md
* reference kata-pkgsync
* move CODEOWNERS to proper place
* remove extra CODE_OF_CONDUCT.md.
* fix spell checker error on Developer-Guide.md

Signed-off-by: Peng Tao <bergwolf@hyper.sh>

tools/packaging/CODE_OF_CONDUCT.md

@@ -1,3 +0,0 @@
-## Kata Containers CI Code of Conduct
-
-Kata Containers follows the [OpenStack Foundation Code of Conduct](https://www.openstack.org/legal/community-code-of-conduct/).

tools/packaging/CONTRIBUTING.md

@@ -1 +0,0 @@
-For details on how to contribute to the Kata Containers project, please see the main [contributing document](https://github.com/kata-containers/community/blob/master/CONTRIBUTING.md).

tools/packaging/README.md

@@ -31,7 +31,7 @@ running Kubernetes Cluster very straightforward.
 
 ## Build a snap package
 
-See [the snap documentation](snap).
+See [the snap documentation](../../snap).
 
 ## Build static binaries
 
@@ -61,6 +61,10 @@ See [the Jenkins documentation](Jenkinsfiles).
 
 See the [scripts documentation](scripts).
 
+## Sync packages
+
+See [the `kata-pkgsync` documentation](cmd/kata-pkgsync).
+
 ## Credits
 
 Kata Containers packaging uses [packagecloud](https://packagecloud.io) for