ci: rework linux script

 * no longer depend on apt.llvm.org, instead we rely on a zig-bootstrap
   tarball with pre-built Zig, LLVM, LLD, and Clang. Similar to the
   Windows Dev Kit but for Linux. This also makes the script no longer
   depend on Docker, libxml2, or GCC.
 * remove bash retry logic; it was only needed for flaky apt.llvm.org
   and isn't needed for the other resources we download.
 * build and upload the experimental std lib automatically generated
   docs. langref.html is moved to docs/langref.html because the std lib
   docs are in docs/std/.
 * the superfluous "zig" directory in $prefix/lib/zig/std/std.zig is
   removed from the tarball.
 * update_download_page makes a commit in the www.ziglang.org repository
   updating data/releases.json so that repository can manage deploys.

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