Add disclaimer and download link (apache#7402)

* Add disclaimer and download link

* Fix

docs/_static/mxnet-theme/index.html

@@ -127,3 +127,10 @@ <h2>Model Zoo</h2>
     </div>
   </div>
 </div>
+
+<div class="section-disclaimer">
+    <img src="https://raw.githubusercontent.com/dmlc/web-data/master/mxnet/image/apache_incubator_logo.png" height=60>
+    <p>
+        Apache MXNet is an effort undergoing incubation at The Apache Software Foundation (ASF), <strong>sponsored by the <i>Apache Incubator</i></strong>. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF.
+    </p>
+</div>

docs/_static/mxnet.css

@@ -717,6 +717,14 @@ li.dropdown-submenu ul.dropdown-menu a {
     filter: grayscale(0%);
 }
 
+.section-disclaimer {
+    padding: 3em 3em 3em;
+}
+
+.section-disclaimer p {
+    padding-top: 2em;
+}
+
 .footer{
     padding-top: 40px;
 }
@@ -1244,3 +1252,9 @@ div.download_btn a:hover {
     padding-bottom: 3px;
     font-style: italic;
 }
+
+/*------------Download source-----------------*/
+#download-source-package {
+    display: none;
+    padding-top: 40px;
+}

docs/build_version_doc/AddPackageLink.py

@@ -0,0 +1,58 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+import os
+import argparse
+from bs4 import BeautifulSoup as bs
+
+parser = argparse.ArgumentParser(description="Add download package link.",
+                                     formatter_class=argparse.ArgumentDefaultsHelpFormatter)
+parser.add_argument('--file_path', type=str, default='docs/_build/html/get_started/install.html',
+                        help='file to be modified')
+parser.add_argument('--current_version', type=str, default='master',
+                        help='Current version')
+
+if __name__ == '__main__':
+    args = parser.parse_args()
+    tag = args.current_version
+
+    src_url = "http://www.apache.org/dyn/closer.cgi/incubator/" \
+              "mxnet/%s-incubating/apache-mxnet-src-%s-incubating.tar.gz" % (tag, tag)
+    pgp_url = "http://www.apache.org/dyn/closer.cgi/incubator/" \
+              "mxnet/%s-incubating/apache-mxnet-src-%s-incubating.tar.gz.asc" % (tag, tag)
+    sha_url = "http://www.apache.org/dyn/closer.cgi/incubator/" \
+              "mxnet/%s-incubating/apache-mxnet-src-%s-incubating.tar.gz.sha" % (tag, tag)
+    md5_url = "http://www.apache.org/dyn/closer.cgi/incubator/" \
+              "mxnet/%s-incubating/apache-mxnet-src-%s-incubating.tar.gz.md5" % (tag, tag)
+
+    download_str = "<div class='btn-group' role='group'>"
+    download_str += "<div class='download_btn'><a href=%s>" \
+                    "<span class='glyphicon glyphicon-download-alt'></span>" \
+                    " Source for %s</a></div>" % (src_url, tag)
+    download_str += "<div class='download_btn'><a href=%s>PGP</a></div>" % (pgp_url)
+    download_str += "<div class='download_btn'><a href=%s>SHA-256</a></div>" % (sha_url)
+    download_str += "<div class='download_btn'><a href=%s>MD5</a></div>" % (md5_url)
+    download_str += "</div>"
+
+    with open(args.file_path, 'r') as html_file:
+        content = bs(html_file, 'html.parser')
+    download_div = content.find(id="download-source-package")
+    download_div['style'] = "display:block"
+    download_div.append(download_str)
+    outstr = str(content).replace('&lt;', '<').replace('&gt;', '>')
+    with open(args.file_path, 'w') as outf:
+        outf.write(outstr)

docs/build_version_doc/build_doc.sh

@@ -57,6 +57,8 @@ then
     cat $tag_list_file
     tests/ci_build/ci_build.sh doc python docs/build_version_doc/AddVersion.py --file_path "docs/_build/html/" \
                                           --current_version "$latest_tag" --root_url "http://mxnet.incubator.apache.org/"
+    tests/ci_build/ci_build.sh doc python docs/build_version_doc/AddPackageLink.py \
+                                          --file_path "docs/_build/html/get_started/install.html" --current_version "$latest_tag"
     cp -a "docs/_build/html/." "$local_build"
     cp $tag_list_file "$local_build/tag.txt"
     rm -rf "$web_folder/.git"

docs/get_started/install.md

@@ -1462,3 +1462,5 @@ Will be available soon.
 
 </div>
 </div>
+
+# Download Source Package