Allow partial redefinition of the ouputs config

[bep]

In Hugo, the default outputs configuration looks like this:

[outputs]
  page = ["HTML"] 
  home = ["HTML", "RSS"] 
  section = ["HTML", "RSS"] 
  taxonomy = ["HTML", "RSS"] 
  taxonomyTerm = ["HTML", "RSS"] 

This is what you get when doing nothing.

The current behaviour says that if you provide your own outputs configuration, it must be complete.

We do, however, add HTML as a fallback for a missing config entry. But, currently, if you want to add JSON to the home page (for a search index), this:

[outputs]
  home = ["HTML", "RSS", "JSON"] 

Will result in missing RSS for the other list types.

This is surprising for users. See gohugoio/hugoDocs#408

• outputFormats, mediaTypes, related, outputs, permalinks(and maybe others) translates into a map in the config.
• For maps with entries of the same type (mediaTypes), Hugo allows redefinition of just one or more entries.
• For maps with entries of different types (related), you must provide the full configuration. The different entries only make sense in relation to the others.

We will follow the rule in the above and change the way outputs behaves.

[kaushalmodi]

I confirm the fix in this commit. Thanks!

[github-actions]

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