Remove stale docs

docs/internal/design.md

@@ -1,4 +0,0 @@
-- Erasure code - http://bit.ly/1yqxkUt (intel isal library)
-- Future erasure codes to look at - Fountain Codes, Simple XOR techniques, Custom
-- Bootstrap techniques - no downtime scenario
-- Simple API's

docs/internal/infra.md

@@ -1,9 +0,0 @@
-- Google groups development (minio-dev)
-- Github groups (https://github.com/minio-io)
-- IRC users #minio
-- Support (zendesk.com)
-- Community Q/A (stackoverflow.com)
-- https://github.com/justinwalsh/daux.io (Document generator) or 'metalsmith.io'
-- Continous integration - (https://drone.io/, https://codeship.io,
-  http://wercker.com/, https://coveralls.io/)
-- Web UI - polymer project