Docs: Updated orcish core industry, incl Blacksmoke and Steamfoundry

* Screenshots for Blacksmoke Furnace and Steamfoundry
* Added description for Steamfoundry
* Massaged HTML and CSS for consistency and clarity
Merge branch 'master' into drowfort

* master:
  Docs: Updated orcish core industry, incl Blacksmoke and Steamfoundry