site clean up

[onthebreeze]

We have been re-thinking the edi3.org suite of specifications and so we now need a little site tidy up to reflect the updated thinking.

See screenshot below.

[kshychko]

@onthebreeze, the site has been cleaned up but https://edi3.org/technical-specs/ needs to be updated to reflect the changes.

[onthebreeze]

Ok I'll get that done before Monday