Bonus: simplify building docs on Windows

bin/build-rust-docs.bat

@@ -0,0 +1,32 @@
+:: Build all docs with one command, on Windows.
+:: Documentation will be placed in `build/docs`.
+:: This behaves the same as build-rust-docs.sh.
+
+:: Note: there's no way to do "set -e" easily in
+:: Windows batch file, other than this:
+:: https://stackoverflow.com/a/13863374/261698
+:: I'm ignoring this for the moment, as I'm the
+:: only consumer for now :-)
+
+:: Set the docs location.
+set "docs_location=build\docs"
+
+:: Set the crate name.
+set "crate_name=glean_core"
+
+:: Switch to the 'docs' subdirectory, build using
+:: mdbook and get back to the current directory.
+pushd docs && mdbook build && popd
+
+cargo doc --no-deps
+
+if exist %docs_location% rmdir /S /Q %docs_location%
+mkdir %docs_location%
+echo "<meta http-equiv=refresh content=0;url=book/index.html>" > %docs_location%\index.html
+
+mkdir %docs_location%\book
+xcopy /K /E docs\book\ %docs_location%\book
+
+mkdir %docs_location%\docs
+xcopy /K /E target\doc\. %docs_location%\docs
+echo "<meta http-equiv=refresh content=0;url=%crate_name%/index.html>\n" > %docs_location%\docs\index.html