Fixed Broken Links in Mainpage.dox
The DigiKam API page, had a few broken links. Namely the OpenCV link, and the link to KDE's library policies. I have updated Mainpage.dox to update the links.
The DigiKam API page, had a few broken links. Namely the OpenCV link, and the link to KDE's library policies. I have updated Mainpage.dox to update the links.