[plt-scheme] hide "welcome to drscheme"

>> My 2 cents:
>>  - proper, complete menus are a must;
>>  - keyboard shortcuts > context menus (except in check syntax mode);
>>  - toolbars not so useful.
>
> Agreed on all points, for the way I prefer to work.  I'd add that  
> toolbars are good for intro students, and no doubt are also good for  
> the way *some* experienced people prefer to work.

Yes sorry. I meant to indicate that these were only personal  
preferences.