docs: Move doc/Doxyfile to .Doxyfile (#903)

While not required, this cleans up the folder structure by moving the `doc` folder to a hidden file at `.Doxyfile`. Compiled documentation is still build to the `doc` folder, which is gitignored.

Author: RobLoach

doc/Doxyfile .Doxyfiledoc/Doxyfile renamed to .Doxyfile

@@ -1,11 +1,7 @@
 demo/*/*/demo
 demo/*/bin/*
 example/bin/*
-docs/xml
-docs/build
-docs/src
-doc/doc*
-doc/*
+/doc
 *.tmp
 *.swo
 *.swp

.gitignore

@@ -10,7 +10,7 @@ SRC_PATH=src
 
 
 ## Documents settings
-DOXYFILE:=$(DOCS_PATH)/Doxyfile
+DOXYFILE:=.Doxyfile
 
 
 ## HEADER file packing settings