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GH-35609: [Docs] Enable the build of subsections of the documentation (#35610)

### Rationale for this change

Ease the process of building the documentation for dev purposes.

### What changes are included in this PR?

- `make` options to build subsections of the documentation (format, developers, cpp together with existing python)
- `make` option for auto-build of the docs
- added info about the new make commands
* Closes: #35609

Lead-authored-by: Alenka Frim <frim.alenka@gmail.com>
Co-authored-by: AlenkaF <frim.alenka@gmail.com>
Signed-off-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>