Generated example config from docs.

The #155 config changes should make it so that config can be commented via tags for the go struct fields. Do this for all config so that the example config is generated and can no longer diverge from reality.

Start by reviewing issue #155 and the Go struct fields that define configuration, then trace how the current example config is produced. Identify the generation entry point and verify that all configuration fields carry comments or tags that are reflected in the generated example, preventing divergence from the structs.

Written by the indexing model from the issue text.