Add a leading file name/path to code blocks consistently

[gingerchew]

What feature were you trying to use?

I was cruising the config documentation.

Where did our docs fail you?

The config documentation had some code blocks that were missing the file name/path that they were related to. Like the vite.config.js blocks didn't have the file name at the top, but the slinkity.config.js ones did.

How can we improve?

The leading file name/path helps me find what I'm looking for, but also helps me not lose track of where I am in the documentation. Having them there in general just helps, regardless of "context change" or only being in one context.

I created a branch that fixed the few I ran into, which I can make a PR for.

[ajcwebdev]

Awesome, I always like having these included in code blocks so thanks for cleaning this up for us. Feel free to open up a PR and we can get that merged for you.

[gingerchew]

All set #81 😊