Forum:Color/font coding of namespaces

Just to make wiki navigation a bit easier for new editors, I've made some changes to the way various namespaces look. Basically, the idea is to make the serif font associated only with the main namespace (normal articles). Sans-serif is to be used for things outside main. And monospace is for those namespaces having to do with the base operation of the MediaWiki software — where quickly seeing the difference between an O and a 0, a 1 and an l are important.

Furthermore, color coding helps in those cases where pages have exactly the same name. This is important now that we have hundreds of pages in the property namespace that have exactly the same name as they do in main. In other words, this helps to distinguish between director, talk:director (if it existed), forum:director (if it existed) and property:director.