Restructure site/ directory into docs/ which only contains Bazel docu…

…mentation.

The new docs/ directory in the bazel source tree will only contain the Bazel
docs site, which is hosted at docs.bazel.build. This change deletes the
marketing site and blog, which have been migrated to the bazel-website and
bazel-blog GitHub repositories respectively.

This change also updates the serve-docs.sh and ci/build.sh under scripts/ in
preparation for publishing the docs site.

Note that to help make reviews more manageable, this change is limited to
moving files to their new locations. Here are the follow-up changes:

* Update all links in docs to remove versions/master in paths and to add
  correct bazel.build subdomain when linking to pages on the marketing site
  or the blog.
* Set up versioned directories on GCS bucket and add tooling for versioning
  docs

This change is also coordinated with
https://bazel-review.googlesource.com/c/11568/ to have the PublishSite job
publish to docs.bazel.build rather than www.bazel.build.

Issue #2397

RELNOTES: None
PiperOrigin-RevId: 157612651

scripts/ci/build.sh

@@ -134,7 +134,7 @@ function bazel_build() {
         cp bazel-genfiles/bazel-distfile.zip $1/bazel-${release_label}-dist.zip
       fi
     fi
-    cp bazel-genfiles/site/jekyll-tree.tar $1/www.bazel.build.tar
+    cp bazel-genfiles/site/jekyll-tree.tar $1/docs.bazel.build.tar
     cp bazel-bin/src/tools/benchmark/webapp/site.tar $1/perf.bazel.build.tar.nobuild
     cp bazel-genfiles/scripts/packages/README.md $1/README.md
   fi

scripts/serve-docs.sh

@@ -59,7 +59,7 @@ build_static() {
 
 build_and_serve() {
   build_tree
-  echo "Serving bazel.build site at $HOST:$PORT"
+  echo "Serving docs.bazel.build site at $HOST:$PORT"
   jekyll serve --host "$HOST" --detach --quiet --port "$PORT" --source "$WORKING_DIR"
 }
 

site/BUILD

@@ -2,15 +2,15 @@ load("@bazel_tools//tools/build_defs/pkg:pkg.bzl", "pkg_tar")
 
 exports_files(
     [
-        "versions/master/docs/bazel-user-manual.html",
+        "docs/bazel-user-manual.html",
         "command-line-reference-prefix.html",
         "command-line-reference-suffix.html",
     ],
 )
 
 DOT_GRAPH_HTML_FILES = [
-    "versions/master/docs/query.html",
-    "versions/master/docs/build-ref.html",
+    "docs/query.html",
+    "docs/build-ref.html",
 ]
 
 filegroup(