Make the configuration documentation in a table.

[kristianbenoit]

So that default is displayed, but on Windows and MacOS, there's a missing default and there are values that dont have a default ?

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• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• UPGRADING.md has been updated with a migration guide (for breaking changes)
• configuration.schema.json updated if new parameters are added.

What kind of change does this PR introduce?

Documentation get's a better format.

What is the current behavior?

The defaults are not really available in the doc and it is a bit hard to understand, plus the directories seems to be there twice.

What is the new behavior?

Documentation is now a table with default values, it should be reviewed to add a few defaults (in code) and the value for buld_cache.path on Windows an MacOS in this doc.

Does this PR introduce a breaking change, and is titled accordingly?

Other information

Sorry, this a pull request replacing #2906 . Which had errors and I fixed bypassed them by creating another pull request after the last changes.

[kristianbenoit]

Sorry for the second PR, I just did not know how to fix the other one (#2906 ) , but it still have mysterious errors. Possibly cause I used   to intend variable level in the table ? Other than that, I see nothing in the details.

[kristianbenoit]

I should have put the variable section (board_manager, daemon, directories, ...) as part of the variable names, the table would have been easier to read and get rid of the   at the same time. Perhaps there's a way to create a table division , i.e. fat lines ?