Required edits to bring new code for --articles into zine and be usable at the cli level

[Bas-Man]

• Make the new_zine_article functionality available.
• Re-work the logic of Commands::New to use match statement instead of if conditionals. Makes the code more maintainable in the future.

[Folyd]

Hi, @Bas-Man. Thanks for you splitting PR, however, it is too fragmented for code review. I think a better approach is to split two PR, one is for the new article feature, and one is for another unrelated. What do you think?

[Bas-Man]

I know. It was a big set of changes. But it was needed to get it on a path that would be more flexible in the future.

Let me know which files you want combined. 'issue.rs', 'article.rs', 'helpers.rs' and 'Cargo.toml' as these go together fairly nicely.

Then 'author.rs', site.rs'

And finally 'lib.rs', 'new.rs' and 'main.rs'

I have left some things unchanged. As they can be refactored out with small pull requests.

Thoughts?

[Bas-Man]

@Folyd I have update the pull request. Waiting your responses.

[Bas-Man]

Pr #183 is the first that needs to be resolved and merged. Then they go in order.

But current there is a merge conflict.