ARROW-3465: [Documentation] Fix gen_apidocs' docker image
It's intend to be only a quickfix for building the apidocs.
@kou I'm still building it locally.
Author: Krisztián Szűcs <szucs.krisztian@gmail.com>
Author: Kouhei Sutou <kou@clear-code.com>
Closes #2723 from kszucs/ARROW-3465 and squashes the following commits:
461ef646 <Kouhei Sutou> Add index page for C GLib API document
5d14f2fd <Kouhei Sutou> Fix a typo
ce6f52fc <Krisztián Szűcs> fix cpp build
af84de6b <Krisztián Szűcs> install python dependencies
efb4deb0 <Krisztián Szűcs> remove parquet-cpp
eb1fb3be <Krisztián Szűcs> fix paths
1f34ac8f <Krisztián Szűcs> quickfix for building apidocs
diff --git a/_docs/c_glib/index.md b/_docs/c_glib/index.md
new file mode 100644
index 0000000..e92788b
--- /dev/null
+++ b/_docs/c_glib/index.md
@@ -0,0 +1,36 @@
+---
+layout: docs
+title: Apache Arrow GLib (C)
+permalink: /docs/c_glib/index.html
+---
+<!--
+{% comment %}
+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.
+{% endcomment %}
+-->
+
+# Apache Arrow GLib (C)
+
+Apache Arrow GLib is a wrapper library for Apache Arrow C++. Apache Arrow GLib provides C API.
+
+Apache Arrow GLib supports [GObject Introspection][gobject-introspection]. It means that you can create language bindings at runtime or compile time automatically.
+
+## API reference manuals
+
+ * [Apache Arrow GLib](arrow-glib/)
+ * [Apache Parquet GLib](parquet-glib/)
+
+[gobject-introspection]: https://wiki.gnome.org/action/show/Projects/GObjectIntrospection
