Move the build stuff to its own dir.

Now Joypy/docs/reference/*.md are just the individual function
documents.

diff --git a/docs/reference/FORMAT-Functor-Reference.md b/docs/reference/mkref/FORMAT-Functor-Reference.md
similarity index 100%
rename from docs/reference/FORMAT-Functor-Reference.md
rename to docs/reference/mkref/FORMAT-Functor-Reference.md

diff --git a/docs/reference/FuncRef.html b/docs/reference/mkref/FuncRef.html
similarity index 100%
rename from docs/reference/FuncRef.html
rename to docs/reference/mkref/FuncRef.html

diff --git a/docs/reference/Functor-Reference.md b/docs/reference/mkref/Functor-Reference.md
similarity index 100%
rename from docs/reference/Functor-Reference.md
rename to docs/reference/mkref/Functor-Reference.md

diff --git a/docs/reference/HEADER.md b/docs/reference/mkref/HEADER.md
similarity index 100%
rename from docs/reference/HEADER.md
rename to docs/reference/mkref/HEADER.md

diff --git a/docs/reference/Makefile b/docs/reference/mkref/Makefile
similarity index 100%
rename from docs/reference/Makefile
rename to docs/reference/mkref/Makefile