Add redirect from rikki-'s profile to /rikki
Add redirect from rikki-'s profile to /rikki

Rikki's profile contains no useful information at the moment. It's
better to redirect to the page that actually does have useful content
about the experiment. Thanks to @colinrymer for bringing it up (and
convincing me that it's the right thing to do).

Closes #2797

IanDCarroll/exercism.io,mhelmetag/exercism.io,IanDCarroll/exercism.io,RaptorRCX/exercism.io,Tonkpils/exercism.io,Tonkpils/exercism.io,tejasbubane/exercism.io,tejasbubane/exercism.io,RaptorRCX/exercism.io,jtigger/exercism.io,mhelmetag/exercism.io,IanDCarroll/exercism.io,nathanbwright/exercism.io,treiff/exercism.io,jtigger/exercism.io,mhelmetag/exercism.io,mhelmetag/exercism.io,nathanbwright/exercism.io,RaptorRCX/exercism.io,treiff/exercism.io,tejasbubane/exercism.io,Tonkpils/exercism.io,k4rtik/exercism.io,nathanbwright/exercism.io,Tonkpils/exercism.io,jtigger/exercism.io,RaptorRCX/exercism.io,treiff/exercism.io,nathanbwright/exercism.io,k4rtik/exercism.io,IanDCarroll/exercism.io,tejasbubane/exercism.io,treiff/exercism.io,jtigger/exercism.io,k4rtik/exercism.io