[SERV-322] Update secretariat info and institution logos

[markmatney]

To test, one may use:

ng serve --env=prod

And visit the following pages:

• http://localhost:4200/about
• http://localhost:4200/institution?name=University%20of%20Toronto
• http://localhost:4200/institution?name=Keio%20University
• http://localhost:4200/institutions