Xv6: HTML Conversion and CMake Build

HTML conversion<p><a href="https:&#x2F;&#x2F;xv6-guide.github.io&#x2F;xv6-riscv-book&#x2F;" rel="nofollow">https:&#x2F;&#x2F;xv6-guide.github.io&#x2F;xv6-riscv-book&#x2F;</a><p>and cmake build<p><a href="https:&#x2F;&#x2F;github.com&#x2F;xv6-guide&#x2F;xv6-riscv&#x2F;blob&#x2F;cmake&#x2F;CMakeLists.txt">https:&#x2F;&#x2F;github.com&#x2F;xv6-guide&#x2F;xv6-riscv&#x2F;blob&#x2F;cmake&#x2F;CMakeLists...</a><p>for xv6: a simple, Unix-like teaching operating system.