Improvements for homepage

The following was raised by @comradekingu
That particular passage doesn't intrinsically say anything about why it is possible to help Jamulus.
It would be possible anyway, so the user is left wondering what the link between helping and the unknown concept is.

People don't know what the GPL is, and even if they did, there are three versions of that license.
There is also "Play music online. With friends. For free." which makes a bigger point out of it being gratis, which undersells freedom.
The landing side is not a place where the decisions made command any sort of authority.
Invocation of "us" for no reason.
Mac should be "macOS". (like it is in the side-menu)
Erroneous use of an ampersand (&).
Triple self-referencing (and then som), with redundant info in the ingress, not line-shifted at that.
and brings → bringing
Wall of text inducing stress.
Exclamation points after two consecutive sentences for no good reason.
Duplicated button making the website more likely to scroll vertically.
"ASIO is a trademark and software of Steinberg Media Technologies GmbH " should be in a mouse-over.

How about reducing the workload to just the work being done and then look at it all once done to see if something can be improved upon?

_Originally posted by @comradekingu in https://github.com/jamulussoftware/jamulus/pull/2880#discussion_r990443819_

Comienza revisando el contenido de la página de inicio y la discusión referenciada desde el pull request #2880. Agrupa los cambios solicitados de redacción, diseño, terminología y presentación antes de realizar cualquier edición. Se considerará terminado cuando las cuestiones de la página de inicio enumeradas se hayan abordado de forma coherente y la landing page revisada se haya revisado en su conjunto.

Escrito por el modelo de indexación a partir del texto del issue.