Draft: Guide

Nearing completion, just lacking content

* = need icons. @sev?

+ = need descriptions

@halogene: would you be interested in bringing the newbie guide to the free text section?

• topic capabilities:
• welcome* (free text capability)
• gametypes
• gametype items+
• mutators*+
• items*+ (need intermediate health/armour icons)
• buffs+
• nades+
• maps
• weapons+
• monsters*+
• turrets*+
• vehicles+
• minor todo:
• consistent sorting, filtering and finding
• hide null objects
• separate powerups from buffs topic