Fix a couple links on the documentation page
Fix a couple links on the documentation page

Also, remove the link to the Merbcamp 2008 presentation, since it
seems to be broken.

nicohvi/sequel,mpalmer/sequel,knut2/sequel,nju520/sequel,offshore-safety/sequel,offshore-safety/sequel,uhoh-itsmaciek/sequel,beni55/sequel,nju520/sequel,davidbegin/sequel,gferguson-gd/sequel,knut2/sequel,mpalmer/sequel,beni55/sequel,chef/sequel,dennis-d/custom_sequel,t-morgan/sequel,yazshel/sequel,freshpay/sequel,freshpay/sequel,t-morgan/sequel,pfarrell/sequel,seeARMS/sequel,offshore-safety/sequel,uhoh-itsmaciek/sequel,davidbegin/sequel,Marketcircle/sequel,dennis-d/custom_sequel,reubano/sequel,bigfix/sequel,seeARMS/sequel,pfarrell/sequel,reubano/sequel,gferguson-gd/sequel,nicohvi/sequel,yazshel/sequel