Wiki has outdated info

[meshula]

This information was last updated 2013, it definitely needs a tweak, or three.

/~https://github.com/openexr/openexr/wiki/Developer-Information

AFAICT the crucial info is now on the Readme landing page, so maybe this wiki page should simply be deleted?

[meshula]

Deleted the developer information page as it would be redundant with information on the landing page, and documentation within the readme. It would be redundant, if it was accurate...