docs: 9. Collections - must have Front Matter

[Zejnilovic]

Motivation

I think you are missing an important piece of information in Collections documentation

Suggestion

Add a note that if the file does not have a Front Matter defined, it will not be registered by Jekyll custom collections.

[ashmaroli]

@Zejnilovic A pull request would be most welcome.
The docs on collections do mention about front matter. But it is vague.

[jekyllbot]

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