Add placeholders to configs.eample

[dfulu]

Add placeholders to config.example and annotate them. It's hopefully cleaner and should make it easier for new users to know what paths they will need to change. Also remove some unused config files

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (8dd0f33) 57.62% compared to head (d6a6a22) 57.62%. Report is 1 commits behind head on main.

:exclamation: Current head d6a6a22 differs from pull request most recent head 13253e1. Consider uploading reports for the commit 13253e1 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #115 +/- ## ======================================= Coverage 57.62% 57.62% ======================================= Files 26 26 Lines 1706 1706 ======================================= Hits 983 983 Misses 723 723 ```

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