Readjust git links and enGrid attachments in the new wiki about engrid HOT 4 CLOSED

Mental note: the mediawiki definitions aren't working as intended on the transferred pages.
To fix, use it like this:

; the thing to define
: The definition

edit - now documented here: https://github.com/enGits/engrid/wiki/How-to-help-with-enGrid%27s-wiki

from engrid.

Another mental note - These pages still need the image links fixed:
https://github.com/enGits/engrid/wiki/Volume-Meshing-from-Existing-Surface-Meshes <- done
https://github.com/enGits/engrid/wiki/Wing-Body-Geometry-%28incomplete%29 <- done
https://github.com/enGits/engrid/wiki/Unstructured-Grids-for-OpenFOAM-With-Blender-and-enGrid-1.2 <- done
https://github.com/enGits/engrid/wiki/enGrid-1.3-Default-Settings <- done
https://github.com/enGits/engrid/wiki/Element-Types <- done
https://github.com/enGits/engrid/wiki/Complete-Mesh-for-a-damper-in-a-duct-%28starting-from-an-STL-geometry%29 <- done
https://github.com/enGits/engrid/wiki/Building-enGrid-on-Windows-with-MSVC2008 <- done

Reference page about images on wiki: https://github.com/github/gollum/

from engrid.

Began writing instructions on how to contribute to the wiki here: https://github.com/enGits/engrid/wiki/How-to-help-with-enGrid's-wiki <- done'ish, because I don't know what else to write.

from engrid.

Git links fixed. All that's left is tying up the mirror at repo.or.cz.

from engrid.