Exclude from xtrn-setup since this requires additional steps

(e.g. creating a sub-board, adding filenames to the .ini).
I would like to tackle that automation in the future through.

xtrn/bullshit/install-xtrn.ini

@@ -2,8 +2,9 @@ Name: Bullshit
 Desc: Lightbar sysop bulletin lister/reader for Synchronet
 By:   echicken -at- bbs.electronicchicken.com
 Cats: Main
-Subs: JavaScript
+Subs: Bulletins, JavaScript
 Inst: 2020/09/07
+xtrn-setup: false
 
 [prog:BULLSHIT]
 cmd  = ?bullshit.js