Docs: Update orc fortress manual. More correct info, better formatting.

* Remvoed mention of the crucible and essence lab. These are not
  used by orcs any more.

* Used much sexy CSS in the freelancers page to make the goblin
  workshops look nicer.
Merge branch 'master' into nerfed_diseases

* master:
  Docs: Update orc fortress manual. More correct info, better formatting.