docs: Removed bogus file from wiki bridge.

That was fixed to not do that again by https://github.com/libsdl-org/ghwikipp/commit/7e429a13d385e448dd2efaf014e5aaddb6eff66b

docs/README-.md

@@ -1,6 +0,0 @@
-#
-
-<!-- BEGIN CATEGORY LIST -->
-- [raspberrypi](raspberrypi)
-<!-- END CATEGORY LIST -->
-