fix broken links (#9537)

* fix broken links

* missing /

* adjustment

dev/intellij-setup.md

@@ -35,7 +35,7 @@ an alias name. You can do this in Using `File` -> `Project Structure...` -> `Pla
 The Code Style is available in XML format at [druid_intellij_formatting.xml](druid_intellij_formatting.xml) and can be [imported into IntelliJ](https://www.jetbrains.com/help/idea/2017.1/copying-code-style-settings.html).
 
 ## Metadata
-The installation of a MySQL metadata store is outside the scope of this document, but instructions on setting up MySQL can be found at [docs/content/development/extensions-core/mysql.md](docs/content/development/extensions-core/mysql.md). This assumes you followed the example there and have a database named `druid` with proper permissions for a user named `druid` and a password of `diurd`.
+The installation of a MySQL metadata store is outside the scope of this document, but instructions on setting up MySQL can be found at [docs/development/extensions-core/mysql.md](/docs/development/extensions-core/mysql.md). This assumes you followed the example there and have a database named `druid` with proper permissions for a user named `druid` and a password of `diurd`.
 
 Use of other databases such as Postgres or Derby are entirely reasonable, but doing so is left as an excercise to the reader.
 

docs/development/build.md

@@ -24,7 +24,7 @@ title: "Build from source"
 
 
 You can build Apache Druid directly from source. Please note that these instructions are for building the latest stable version of Druid.
-For building the latest code in master, follow the instructions [here](https://github.com/apache/druid/blob/master/docs/content/development/build.md).
+For building the latest code in master, follow the instructions [here](https://github.com/apache/druid/blob/master/docs/development/build.md).
 
 
 #### Prerequisites

docs/development/extensions-contrib/moving-average-query.md

 ---
 id: moving-average-query
+title: "Moving Average Query"
 ---
 
 <!--

extensions-contrib/README.md

@@ -19,7 +19,7 @@
   
 # Community Extensions
 
-Please contribute all community extensions in this directory and include a doc of how your extension can be used under /docs/content/development/extensions-contrib/.
+Please contribute all community extensions in this directory and include a doc of how your extension can be used under [docs/development/extensions-contrib/](/docs/development/extensions-contrib).
 
 Please note that community extensions are maintained by their original contributors and are not packaged with the core Druid distribution. 
 If you'd like to take on maintenance for a community extension, please post on [dev@druid.apache.org](https://lists.apache.org/list.html?dev@druid.apache.org) to let us know!

extensions-contrib/moving-average-query/README.md

@@ -26,4 +26,4 @@ Overview
 
 Documentation 
 =============
-See the druid.apache.org website or under [Druid Github Repo](https://github.com/apache/druid/tree/master/docs/content/development/extensions-contrib/moving-average-query.md).
+See the druid.apache.org website or under [Druid Github Repo](https://github.com/apache/druid/tree/master/docs/development/extensions-contrib/moving-average-query.md).

website/i18n/en.json

@@ -120,7 +120,7 @@
         "title": "Moment Sketches for Approximate Quantiles module"
       },
       "development/extensions-contrib/moving-average-query": {
-        "title": "development/extensions-contrib/moving-average-query"
+        "title": "Moving Average Query"
       },
       "development/extensions-contrib/opentsdb-emitter": {
         "title": "OpenTSDB Emitter"