Add wiki directory to the site

Created the directory
Added MDwiki 0.6.1 slim as wiki/index.html
Added an index.md page
Added navigation.md for the nav bar

wiki/index.md

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+# Aney.co.uk Wiki
+
+Powered by MDwiki
+
+## Why a Wiki?
+
+1. Because I wanted somewhere to dump markdown docs, etc.
+2. I want to see what I can host on my T420 (then migrating to a RPI 3)
+3. Potentially I can use this for blog posts
+

wiki/navigation.md

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+# Aney's Wiki
+
+[Home](../)
+[Wiki Home](index.md)