Removed Facebook and Twitter handle

Author: mcoonen

_config.yml

@@ -33,10 +33,10 @@ about-author: Library Systems and Development
 email: # Add your Email address
 phone: # Add your Phone number
 website: https://library.maastrichtuniversity.nl # Add your website
-facebook: MaastrichtUniversityLibrary
+facebook: # Add your Facebook handle
 instagram: maastrichtuniversitylibrary
 linkedin: maastricht-university-library # Add your Linkedin handle
-twitter: 'um_library' # Add your Twitter handle
+twitter: # Add your Twitter handle (between single quotes '')
 youtube: UC4Wa2-Bx-TE3U3weAIAnfKw
 github: maastrichtu-library # Add your Github handle