link to Slow_Query_Questions from wiki/Main Page

Hi,

I'm suggesting to link to:
https://wiki.postgresql.org/wiki/Slow_Query_Questions

From either:
https://wiki.postgresql.org/wiki/Main%20Page
or:
https://wiki.postgresql.org/wiki/Performance_Optimization

I know it's a wiki, but it looks like I'm not allowed to edit the 'Main' page,
so I'm asking here, which is prolly for the best anyway.  Feel free to forward
to or ask for opinion on the -perform list.

Thanks,
Justin