cleanup, remove old pages

diff --git a/llvm_on_riscv.mdwn b/llvm_on_riscv.mdwn
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-# Compiling LLVM on RISC-V
-
-By simply copying & pasting the following, absolutely verbatim with no
-changes, you can get a working clang from the head of the official llvm
-master branch. I've tested it on a completely virgin install of Ubuntu
-16.04 LTS server. It should work on other versions of Ubuntu and on
-other Debian-based distros. (If it doesn't then please let me know)
-
-Note that you currently must use a soft float version of the rv32 compiler
-and libraries.
-
-You can skip the gnu toolchain and/or qemu parts if you already have
-those.
-
-    # about 17 GB of disk space is needed
-    # entire process takes (not including apt-get, which is about 90 seconds on AWS):
-    #   87m10s on i7-8650U Intel NUC with 32 GB RAM (on 30 Mbps VDSL internet in NZ)
-    #   20m40s on server with Xeon E5-2667v4 @3.20GHz (16 cores)
-    #   17m30s on an AWS m5.12xlarge with fresh Ubuntu 16.04 AMI (ami-4e79ed36)
-
-    #harmless if things are already installed. Obviously you can't do it if
-    #you're not an admin
-    sudo apt-get update
-    sudo apt-get -y dist-upgrade
-    sudo apt-get -y install \
-      binutils build-essential libtool texinfo \
-      gzip zip unzip patchutils curl git \
-      make cmake ninja-build automake bison flex gperf \
-      grep sed gawk python bc \
-      zlib1g-dev libexpat1-dev libmpc-dev \
-      libglib2.0-dev libfdt-dev libpixman-1-dev 
-
-    mkdir riscv
-    cd riscv
-    mkdir _install
-    export PATH=`pwd`/_install/bin:$PATH
-
-    git clone --recursive https://github.com/riscv/riscv-gnu-toolchain
-    pushd riscv-gnu-toolchain
-    ./configure --prefix=`pwd`/../_install --with-arch=rv32gc --with-abi=ilp32
-    make -j`nproc`
-    popd
-
-    git clone https://github.com/riscv/riscv-qemu
-    pushd riscv-qemu
-    ./configure --prefix=`pwd`/../_install --target-list=riscv32-linux-user
-    make -j`nproc` install
-    popd
-
-    git clone https://github.com/llvm-project/llvm-project-20170507 llvm
-    pushd llvm
-    (cd llvm/tools; ln -s ../../clang .) 
-    mkdir _build
-    cd _build
-    cmake -G Ninja -DCMAKE_BUILD_TYPE="Release" \
-      -DBUILD_SHARED_LIBS=True -DLLVM_USE_SPLIT_DWARF=True \
-      -DLLVM_OPTIMIZED_TABLEGEN=True -DLLVM_BUILD_TESTS=False \
-      -DDEFAULT_SYSROOT="../../_install/riscv32-unknown-elf" \
-      -DGCC_INSTALL_PREFIX="../../_install" \
-      -DLLVM_DEFAULT_TARGET_TRIPLE="riscv32-unknown-elf" \
-      -DLLVM_TARGETS_TO_BUILD="" \
-      -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD="RISCV" \
-      ../llvm
-    cmake --build .
-    alias clang-rv32="`pwd`/bin/clang -Xclang -iwithsysroot -Xclang /include \
-      -ccc-gcc-name riscv32-unknown-elf-gcc \
-      -target riscv32 -march=rv32imc"
-    popd
-
-    cat >hello.c <<END
-    #include <stdio.h>
-
-    int main(){
-      printf("Hello RISCV!\n");
-      return 0;
-    }
-    END
-
-    clang-rv32 -O1 hello.c -o hello
-    qemu-riscv32 hello
-