Revert "Generate a zip file of offline docs and a Dash/Zeal docset. (#24244)" (#24313)

This reverts commit f3a4f7e86da61243d3012ee5229302ba2e73172d.

Accidental merge on red.
diff --git a/dev/bots/docs.sh b/dev/bots/docs.sh
index 6a3088e..144a78c 100755
--- a/dev/bots/docs.sh
+++ b/dev/bots/docs.sh
@@ -30,42 +30,6 @@
   echo "$(cd -P "$(dirname "$script_location")" >/dev/null && pwd)"
 }
 
-# Zip up the docs so people can download them for offline usage.
-function create_offline_zip() {
-  # Must be run from "$FLUTTER_ROOT/dev/docs"
-  echo "Zipping Flutter offline docs archive."
-  rm -rf flutter.docs.zip doc/offline
-  (cd ./doc; zip -r -9 -q ../flutter.docs.zip .)
-}
-
-# Generate the docset for Flutter docs for use with Dash, Zeal, and Velocity.
-function create_docset() {
-  # Must be run from "$FLUTTER_ROOT/dev/docs" Must have dashing installed: go
-  # get -u github.com/technosophos/dashing Dashing produces a LOT of output
-  # (~30MB), so we redirect it, and just show the end of it if there was a
-  # problem.
-  echo "Building Flutter docset."
-  rm -rf flutter.docset
-  sed -e "s/{{VERSION}}/$FLUTTER_VERSION/g" dashing.json.tmpl > dashing.json && \
-  (dashing build --source ./doc --config ./dashing.json > /tmp/dashing.log 2>&1 || (tail -100 /tmp/dashing.log; false)) && \
-  tar cf flutter.docset.tar.gz --use-compress-program="gzip --best" flutter.docset
-}
-
-function move_offline_into_place() {
-  # Must be run from "$FLUTTER_ROOT/dev/docs"
-  echo "Moving offline data into place."
-  mkdir -p doc/offline
-  mv flutter.docs.zip doc/offline/flutter.docs.zip
-  du -sh doc/offline/flutter.docs.zip
-  if [[ "$CIRRUS_BRANCH" == "stable" ]]; then
-    echo -e "<entry>\n  <version>${FLUTTER_VERSION}</version>\n  <url>https://docs.flutter.io/offline/flutter.docset.tar.gz</url>\n</entry>" > doc/offline/flutter.xml
-  else
-    echo -e "<entry>\n  <version>${FLUTTER_VERSION}</version>\n  <url>https://master-docs-flutter-io.firebaseapp.com/offline/flutter.docset.tar.gz</url>\n</entry>" > doc/offline/flutter.xml
-  fi
-  mv flutter.docset.tar.gz doc/offline/flutter.docset.tar.gz
-  du -sh doc/offline/flutter.docset.tar.gz
-}
-
 # So that users can run this script from anywhere and it will work as expected.
 SCRIPT_LOCATION="$(script_location)"
 # Sets the Flutter root to be "$(script_location)/../..": This script assumes
@@ -89,13 +53,12 @@
 
 # Make sure dart is installed by invoking flutter to download it.
 "$FLUTTER" --version
-FLUTTER_VERSION=$(cat "$FLUTTER_ROOT/version")
 
 # If the pub cache directory exists in the root, then use that.
 FLUTTER_PUB_CACHE="$FLUTTER_ROOT/.pub-cache"
 if [[ -d "$FLUTTER_PUB_CACHE" ]]; then
-  # This has to be exported, because pub interprets setting it to the empty
-  # string in the same way as setting it to ".".
+  # This has to be exported, because pub interprets setting it
+  # to the empty string in the same way as setting it to ".".
   export PUB_CACHE="${PUB_CACHE:-"$FLUTTER_PUB_CACHE"}"
 fi
 
@@ -109,17 +72,6 @@
 (cd "$FLUTTER_ROOT" && "$DART" "$FLUTTER_ROOT/dev/tools/dartdoc.dart")
 (cd "$FLUTTER_ROOT" && "$DART" "$FLUTTER_ROOT/dev/tools/java_and_objc_doc.dart")
 
-# Zip up the docs so people can download them for offline usage.
-(cd "$FLUTTER_ROOT/dev/docs"; create_offline_zip)
-
-# Generate the docset for Flutter docs for use with Dash, Zeal, and Velocity.
-(cd "$FLUTTER_ROOT/dev/docs"; create_docset)
-
-# Move the offline archives into place, now that all the processing of the doc
-# directory is done. This avoids the tools recursively processing the archives
-# as part of their process.
-(cd "$FLUTTER_ROOT/dev/docs"; move_offline_into_place)
-
 # Ensure google webmaster tools can verify our site.
 cp "$FLUTTER_ROOT/dev/docs/google2ed1af765c529f57.html" "$FLUTTER_ROOT/dev/docs/doc"
 
diff --git a/dev/ci/docker_linux/Dockerfile b/dev/ci/docker_linux/Dockerfile
index 8f0e546..461220d 100644
--- a/dev/ci/docker_linux/Dockerfile
+++ b/dev/ci/docker_linux/Dockerfile
@@ -21,7 +21,6 @@
   git \
   wget \
   curl \
-  zip \
   unzip \
   ca-certificates \
   gnupg
@@ -35,7 +34,6 @@
 # Install the rest of the dependencies.
 RUN apt-get install -y --no-install-recommends \
   locales \
-  golang \
   ruby \
   ruby-dev \
   nodejs \
@@ -84,22 +82,13 @@
 ENV PATH="/usr/bin:${PATH}"
 RUN dpkg-query -L nodejs
 # Install Firebase
-# This is why we need nodejs installed.
-RUN /usr/bin/npm --verbose install -g firebase-tools
-
-# Install dashing
-# This is why we need golang installed.
-RUN mkdir -p /opt/gopath/bin
-ENV GOPATH=/opt/gopath
-ENV PATH="${GOPATH}/bin:${PATH}"
-RUN go get -u github.com/technosophos/dashing
+RUN /usr/bin/npm install -g git://github.com/firebase/firebase-tools.git
 
 # Set locale to en_US
 RUN locale-gen en_US "en_US.UTF-8" && dpkg-reconfigure locales
 ENV LANG en_US.UTF-8
 
 # Install coveralls and Firebase
-# This is why we need ruby installed.
 RUN gem install coveralls
 RUN gem install bundler
 
diff --git a/dev/docs/dashing.json.tmpl b/dev/docs/dashing.json.tmpl
deleted file mode 100644
index 09ade88..0000000
--- a/dev/docs/dashing.json.tmpl
+++ /dev/null
@@ -1,91 +0,0 @@
-{
-    "name": "flutter",
-    "package": "flutter",
-    "version": "{{VERSION}}",
-    "author": {
-      "name": "The Flutter Team",
-      "link": "https://flutter.io"
-    },
-    "index": "index.html",
-    "selectors": {
-        "#exceptions span.name a": {
-            "type": "Exception"
-        },
-
-        "body > main > div.col-xs-12.col-sm-9.col-md-8.main-content > h1": {
-            "requiretext": " library",
-            "type": "Library",
-            "regexp": " library",
-            "replacement": ""
-        },
-
-        "body > main > div.col-xs-12.col-sm-9.main-content > h1": {
-            "requiretext": " class",
-            "type": "Class",
-            "regexp": " class",
-            "replacement": ""
-        },
-
-        "body > main > div.col-xs-12.col-md-8.main-content > h1": {
-            "requiretext": " function",
-            "type": "Function",
-            "regexp": " function",
-            "replacement": ""
-        },
-
-        "body > main > div.col-sm-9.col-md-8.main-content > h1": {
-            "requiretext": " typedef",
-            "type": "Type",
-            "regexp": " typedef",
-            "replacement": ""
-        },
-
-        "body > main > .col-xs-12.col-sm-9.col-md-8.main-content > h1": {
-            "requiretext": " enum",
-            "type": "Enum",
-            "regexp": " enum",
-            "replacement": ""
-        },
-
-        "body > main > .col-md-8.main-content > h1": {
-            "requiretext": " constant",
-            "type": "Constant",
-            "regexp": " constant",
-            "replacement": ""
-        },
-
-        "body > main > div.col-xs-12.col-sm-9 > h1": {
-            "requiretext": " method",
-            "type": "Method",
-            "regexp": " method",
-            "replacement": ""
-        },
-
-        "body > main > .col-xs-12.col-sm-9.col-md-8 > h1": {
-            "requiretext": " property",
-            "type": "Property",
-            "regexp": " property",
-            "replacement": ""
-        },
-
-        "body > main > .col-xs-12.col-md-8 > h1": {
-            "requiretext": " constructor",
-            "type": "Constructor",
-            "regexp": " constructor",
-            "replacement": ""
-        },
-
-        "body > main > .col-xs-12.col-sm-9.main-content > h1": {
-            "requiretext": "operator ",
-            "type": "Operator",
-            "regexp": "operator ",
-            "replacement": ""
-        }
-    },
-    "ignore": [
-        "ABOUT"
-    ],
-    "icon32x32": "icon.png",
-    "allowJS": true,
-    "ExternalURL": "https://docs.flutter.io"
-}