How to configure to ignore paths/directories/folders?

- [x] I am on the [latest](https://github.com/KELiON/cerebro/releases/latest) Cerebro.app version
- [x] I have searched the [issues](https://github.com/KELiON/cerebro/issues) of this repo and believe that this is not a duplicate

- **OS version and name**: Elementary OS 0.4/Loki (Ubuntu 16.04)
- **Cerebro.app version**: 0.2.7_amd64.deb
- **Relevant information from devtools:** N/A

## Issue

How can I set Cerebro to ignore paths/directories/folders? I have duplicate app launcher icons from ```/usr/share/applications/``` in my ```~/.local/share/applications/``` due to the way Loki's dock, [plank,](https://translate.google.ca/translate?hl=en&sl=fr&u=http://www.elementaryos-fr.org/documentation/customisation/plank/&prev=search) currently must be configured. I would like to ignore these *.desktop files located in that home dir's path.

While I've ensured these ```~/.local/share/applications/*.desktop``` files all contain ```NoDisplay=true``` to so they do not appear as duplicates within Loki's Applications menu, I think I would also be interested in the ability to exclude other paths from Cerebro as well (eg: ~/tmp/*). How can this be accomplished?

(EDIT: clarity)