[s2706] Drop some special gossips which are now handled by database

The following scripts are dropped:
mount vendor
alchemy profession npc
Sayge - darkmoon faire

Signed-off-by: Xfurry <xfurry@scriptdev2.com>

(based on commit cdf5532)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>