The newly added information is way too verbose and non-practical for a
"Getting started". Therefore adding an "Overview" heading and moving the
"Getting started" back to where it originally was.

(cherry picked from commit b313a631)

Signed-off-by: David Bauer <mail@david-bauer.net>

Co-authored-by: David Bauer <mail@david-bauer.net>

(cherry picked from commit bf8c3bab)

Signed-off-by: David Bauer <mail@david-bauer.net>

(cherry picked from commit 7f3a3042)

(cherry picked from commit 447595f0)

(cherry picked from commit 63ebeb25)

(cherry picked from commit 239c379d)