Make home URL optional and support dependencies

[minhdanh]

What this PR does / why we need it:
home is optional according to Helm's docs: https://helm.sh/docs/topics/charts/

home: The URL of this projects home page (optional)

Chart.yaml also has optional declaration for dependencies:

dependencies: # A list of the chart requirements (optional)
  - name: The name of the chart (nginx)
    version: The version of the chart ("1.2.3")
    repository: The repository URL ("https://example.com/charts") or alias ("@repo-name")
    condition: (optional) A yaml path that resolves to a boolean, used for enabling/disabling charts (e.g. subchart1.enabled )
    tags: # (optional)
      - Tags can be used to group charts for enabling/disabling together
    enabled: (optional) Enabled bool determines if chart should be loaded
    import-values: # (optional)
      - ImportValues holds the mapping of source values to parent key to be imported. Each item can be a string or pair of child/parent sublist items.
    alias: (optional) Alias to be used for the chart. Useful when you have to add the same chart multiple times

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

[smlx]

This field is optional according to https://helm.sh/docs/topics/charts/#the-chartyaml-file

[minhdanh]

@smlx Thanks. I've just updated that

[minhdanh]

@smlx Can we have this merged this soon?

[smlx]

I'd love to, but I don't have a commit bit. That said, LGTM.