Repository clean-up

## Issue

* The size of the repository is more than 6 GB at the moment. We need to clean up the files which are not relevant or required for Kubeplus to work.

```
$ curl -s https://api.github.com/repos/cloud-ark/kubeplus | jq '.size' | numfmt --to=iec --from-unit=1024
6.6G
```

Start by inspecting the repository contents and measuring its size with the curl, jq, and numfmt command shown in the issue. Identify files that are not required for Kubeplus to work, then verify that the repository is substantially smaller without affecting its operation.

Written by the indexing model from the issue text.