Welcome screen should be handled like a regular editor

IMHO currently the welcome screen is useless to me and the users I know of.

It blocks the full screen with information which does not feel important. I'm not aware that Eclipse IDE users interact with this view other than closing it to remove the "block" of the IDE.

Also if I minimize it adds to the toolbar in a way I find not adding value to my IDE experience.

I also do not know how to get back to the main Welcome screen once I clicked on of the buttons.

Vscode handles its "News" as a regular editor which I find much more engaging as it does not block the IDE or clutters the toolbar with new items.

Therefore, I suggest we also open the Welcome screen in the editor area. This would allow the user to use it without blocking the whole IDE if it is open.

cc @merks @HeikoKlare WDYT?