Thumbnail links have wrong destination on main page, etc.

Steps to reproduce:
1. Log in
2. https://www.fakku.net/
3. Click on a thumbnail

Expected behavior: Open the hentai

Actual behavior: Taken to same URL as before

These kind of pages (2-page preview) are not OK:

• https://www.fakku.net/

• https://www.fakku.net/artists/ushino-kandume

• https://www.fakku.net/tags/vanilla

• https://www.fakku.net/publishers/fakku

These kind of pages (1-page preview) are OK:

• https://www.fakku.net/hentai

• Library subpages