Remove the obsolete README.json_object-split.md, and mark README.md as being the doxygen mainpage.

README.json_object-split.md

@@ -1,15 +0,0 @@
-
-This branch implements the changes briefly described at:
-
-https://github.com/json-c/json-c/wiki/Proposal:-struct-json_object-split
-
-These were originally mentioned in:
-Issue #535 - short string optimization: excessive array length
-
-The changes are expected to impact and possibly invalidate:
-Issue #552 - Some anlysis about memory allocator in json-c
-
-and will likely cause notable conflicts in any other significant un-merged
-changes, such as PR#620 - Introduce json_object_new_string_{ext,noalloc}()
-
-

README.md

@@ -1,3 +1,5 @@
+\mainpage
+
 `json-c`
 ========
 
@@ -240,4 +242,4 @@ following more specific header files:
 * json_visit.h   - Methods for walking a tree of json-c objects.
 * json_util.h    - Miscelleanous utility functions.
 
-For a full list of headers see [files.html](http://json-c.github.io/json-c/json-c-0.13.1/doc/html/files.html)
+For a full list of headers see [files.html](http://json-c.github.io/json-c/json-c-current-release/doc/html/files.html)