simplify default config

[filipmnowak]

related to: #803

i was looking around for an optimal pattern (for example here and here) any my conclusion as of now is:

• it's quite hard to avoid opinionated example.
• for what it's worth, majority of example configs are rather simple.
• good example configuration probably should target first-time user (more experienced user will likely have their own patterns to follow and experience to implement those).

i did some basic testing with v0.7.0 compiled against Elixir 1.17.0 (compiled with Erlang/OTP 27).

[scohen]

@scottming how does this look to you?