Expanded the introduction and possible areas of contribution. Also
improved structure and added more links to communication channels.
Removed the description of how patches can be submitted, in favour
of a more prominent link to welcome.gnome.org, which provides this
information in much more depth.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-calendar/-/merge_requests/855>
The code block for the commit message contains blank characters that are
breaking the markdown rendering engine, making the message block to
stop right after the first paragraph, and getting rid of the last line.
Simply cleaning these blank characters make the code block to render
properly. Note that I've also specified the type of the block, which is
plain text.
Niklas Wimmer