Update the Wiki

[blackfisch]

I noticed that the wiki is a bit out of date or unclear in some parts and should be updated. Possible changes include:

• Removing instructions for older versions (extDB2 legacy stuff)
• Providing a Script for SteamCMD (for updating arma and such)
• Syntax-Highlighting for Code-Blocks
• Better styling
• Better Tanoa Life explanations & integration in server.cfg
• Installation Instructions for Headless Client
• Creating firewall rules (Thanks, Windows)

Because Github doesn't allow Wiki-Forking (why tho?) I created a gist implementing the above mentioned changes, which could be merged into this wiki: https://gist.github.com/BlackFisch/98f4f2d48a15e164af785a1fc4692fd5

If you have any suggestions, let me know :)

[blackfisch]

@BoGuu @Jawshy :)

[BoGuu]

Diff for reference:

https://gist.github.com/BoGuu/29fe5638459799857f6b5660bb0ff27d

[blackfisch]

Updated the Gist to check for HC precense before starting it
(also added updated diff to the gist)