[FIX] doc: correct erroneous installation instructions

This commit corrects erroneous instructions in the documentation page for the installation of Odoo.

Additionally, the following changes are made:
- Add new instructions where the steps were not clear or complete enough.
- Replace some installation flows for an easier onboarding.
- Rework some parts of the page structure and display.
- Add a "running odoo" section for Mac OS.
- Fix display error in views.rst

task-2072822

closes odoo/odoo#42900

X-original-commit: 82471da5
Signed-off-by: Antoine Vandevenne (anv) <AntoineVDV@users.noreply.github.com>