Store config files in the same place

> [!NOTE]
> Migrated from [augurlabs/augur#3302](https://github.com/augurlabs/augur/issues/3302)
> Originally opened by `@MoralCode` on 2025-10-07

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I notice there are many config files referenced thoughout this repo.

- `db.config.json` in `__init__`, db, and engine within the cli module
- `augur.config.json` in the CLI
- `config.yml` in app/view/init, for which `CONFIG_LOCATION=/config/config.yml` in the dockerfile is defined

Can we standardize the concept of a config directory so all these files can be in one place and we can start reorganizing how config is done?