README: Available Settings section unclear

[Chealer]

The README's Available Settings section documents about 20 settings, but its format is hard to read. There is a JSON excerpt associated with each setting, and some notes.

For example, for the first setting, the content is:

This is confusing because:

1. Excerpts are not described.
2. Notes and excerpts are outside of their corresponding entry.
3. Some descriptions are unclear (for example, the first one).
4. The described settings are not indicated.