refactor: Merge vanilla default files with normal config files

[Leguan16]

I do not like the current solution to the "how-to vanilla" page. Thats why I am proposing a refactor that merges the two files with adding a vanilla field to config options that alter the vanilla behavior.

only-merge-items-horizontally:
  vanilla: "true"
  default: "false"
  description: >-
    Prevents merging items that are not on the same y level, preventing potential
    visual artifacts.

I am aware of the unnecessary nodes showing no default value. Unfortunately, I did not yet find a way to get rid of them without major refactoring of already existing code. If you have suggestions, please share!

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[Leguan16]

should be open for reviews now!

[Leguan16]

Alright will do! I also like it way more than the current version.

[Leguan16]

I like this implementation a lot more, thanks! One thing, could you please rename this vanilla within the ConfigDocBlock to something more like showVanillaValue or something slightly more self explanatory. Good to merge then

changed the param name.