Add aliases for kustomization application

[mhaligowski]

https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#apply

Standards checklist:

• The PR title is descriptive.
• The PR doesn't replicate another PR which is already open.
• I have read the contribution guide and followed all the instructions.
• The code follows the code style guide detailed in the wiki.
• The code is mine or it's from somewhere with an MIT-compatible license.
• The code is efficient, to the best of my ability, and does not waste computer resources.
• The code is stable and I have tested it myself, to the best of my abilities.

Changes:

• Adds aliases for applying kustomization directories

[bartekpacia]

Thank you, this should be OK to merge.

[mhaligowski]

Thanks @bartekpacia is there anything I need to do before merging? GH says I need write permission.

[bartekpacia]

Honestly, I'm not sure so I'll ask @larson-carter about this

[mcornella]

Please add the aliases to the plugin README before a merge can happen.

[sylwit]

@mhaligowski I know it's been a while but any chance you fix the README so this PR can be merged. Thank you

[carlosala]

kak is the command for kakoune editor, we'd need another name.