Also restore Makefile.sphinx which is needed to build the documentation.

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Summary:
This patch is provided in preparation for removing autoconf on 1/26. The proposal to remove autoconf on 1/26 was discussed on the llvm-dev thread here: http://lists.llvm.org/pipermail/llvm-dev/2016-January/093875.html

    "This is the way [autoconf] ends
    Not with a bang but a whimper."
    -T.S. Eliot

Reviewers: chandlerc, grosbach, bob.wilson, echristo

Subscribers: klimek, cfe-commits

Differential Revision: http://reviews.llvm.org/D16472

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This fixes the URL permanence of that URL. This is a bit of a hack. See
the FIXME in the patch for what the "real" solution should be.

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I don't think this will be visible just yet on <clang.llvm.org/docs/>
since I don't think that the necessary server-side setup has taken
place.

Don't shoot me over the theme. I don't want to duplicate LLVM's theme
into the clang repo at the moment, so I just used one of Sphinx's
default themes.

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