Added some more pages to the wiki.

• Added Network Engineer topics page. I’ll probably keep working on that page and the various topics there.
• Tried out MediaWiki, but it’s so slow… I can’t seem to enable caching. I’ll come back to it once I can make it fast. The site is under /wiki2.
• Learning Perl right now.
• Probably learn some more non-networking stuff for the rest of 2013.