fix: rename config.yaml.sample to maintain code hinting

[mrsimonemms]

Enables the pretty colours in my IDE (and GitHub) so easier to read

[brendan-myers]

A couple reasons why this wasn't named config.yaml;

• config.yaml is the default filename the proxy looks for, so this might be confusing if someone tries to build/run without realising they need to provide a valid config.
• helps avoid accidentally committing an actual config to github.

We could rename it config.sample.yaml which would enable pretty colours and still avoid the issues above. Thoughts?

[mrsimonemms]

Yeah, naming is config.sample.yaml is what I've done, isn't it? (I'm now doubting my ability to read 😄)

[brendan-myers]

Well this is embarrassing for me 🤦‍♂️ On the bright side, at least even with my lack of reading comprehension I still managed to come to the same conclusion!

[mrsimonemms]

Don't fret it mate. Your awesomity has to come with human frailties else the rest of us couldn't keep up ❤️