Remove old INDEX file as contents already specified in README.md.

diff --git a/INDEX b/INDEX
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-CMakeLists.txt  cmake build file
-ChangeLog.zlib  history of changes up to the fork from zlib 1.2.11
-FAQ.zlib        Frequently Asked Questions about zlib, as distributed in zlib 1.2.11
-INDEX           this file
-Makefile        dummy Makefile that tells you to ./configure
-Makefile.in     template for Unix Makefile
-README          guess what
-README.zlib     Copy of the original README file distributed in zlib 1.2.11
-configure       configure script for Unix
-test/example.c  zlib usages examples for build testing
-test/minigzip.c minimal gzip-like functionality for build testing
-test/infcover.c inf*.c code coverage for build coverage testing
-treebuild.xml   XML description of source file dependencies
-zconf.h.cmakein zconf.h template for cmake
-zconf.h.in      zconf.h template for configure
-zlib.3          Man page for zlib
-zlib.3.pdf      Man page in PDF format
-zlib.map        Linux symbol information
-zlib.pc.in      Template for pkg-config descriptor
-zlib.pc.cmakein zlib.pc template for cmake
-zlib2ansi       perl script to convert source files for C++ compilation
-
-arch/           architecture-specific code
-doc/            documentation for formats and algorithms
-win32/          makefiles for Windows
-
-                zlib public header files (required for library use):
-zconf.h
-zlib.h
-
-                private source files used to build the zlib library:
-adler32.c
-compress.c
-crc32.c
-crc32.h
-deflate.c
-deflate.h
-gzclose.c
-gzguts.h
-gzlib.c
-gzread.c
-gzwrite.c
-infback.c
-inffast.c
-inffast.h
-inffixed.h
-inflate.c
-inflate.h
-inftrees.c
-inftrees.h
-trees.c
-trees.h
-uncompr.c
-zutil.c
-zutil.h