simplify .gitignore to project-specific entries per:
simplify .gitignore to project-specific entries per:

https://twitter.com/aryairani/status/1210682354139877382?s=20
http://stratus3d.com/blog/2018/06/03/stop-excluding-editor-temp-files-in-gitignore/

tl;dr: If your favorite editor or tool creates temp files you don't want to version,
include them in your personal, global .gitignore, rather than in Unison's.

unisonweb/platform,unisonweb/platform,unisonweb/platform