PHP-196: Updating building and testing documentation

* Updating Windows build to default to non-thread-safety
* Fixing titles and rewrites from merge

Author: mikefero

docs.yaml

@@ -3,6 +3,10 @@ summary:  DataStax PHP Driver for Apache Cassandra
 homepage: http://datastax.github.io/php-driver/
 theme:    datastax
 sections:
+  - title:     Building PHP Extension
+    prefix:    /building
+    type:      markdown
+    files:     'ext/README.md'
   - title:     Features
     prefix:    /features
     sources:
@@ -25,6 +29,12 @@ rewrites:
   - \#L92: '#using-cassandra-the-tinyint-and-smallint-types'
   - \#L135: '#using-cassandra-date-type'
   - \#L170: '#using-cassandra-time-type'
+  - vc_build.bat: https://github.com/datastax/php-dse-driver/blob/master/ext/vc_build.bat
+  - http://downloads.datastax.com/php-driver/1.0.0/: http://downloads.datastax.com/php-driver/
+  - http://downloads.datastax.com/php-driver/1.1.0/: http://downloads.datastax.com/php-driver/
+  - http://downloads.datastax.com/php-driver/1.2.0/: http://downloads.datastax.com/php-driver/
+  - http://datastax.github.io/php-driver/api/Cassandra/interface.Type/: https://docs.datastax.com/en/developer/php-driver/latest/api/Cassandra/class.Type/
+  - http://datastax.github.io/php-driver/features/http://localhost:8000/features/datatypes/: https://docs.datastax.com/en/developer/php-driver/latest/features/
 links:
   - title: Binaries
     href:  http://downloads.datastax.com/php-driver
@@ -40,12 +50,6 @@ links:
     href:  https://academy.datastax.com/slack
   - title: Releases
     href:  https://github.com/datastax/php-driver/releases
-rewrites:
-  - http://downloads.datastax.com/php-driver/1.0.0/: http://downloads.datastax.com/php-driver/
-  - http://downloads.datastax.com/php-driver/1.1.0/: http://downloads.datastax.com/php-driver/
-  - http://downloads.datastax.com/php-driver/1.2.0/: http://downloads.datastax.com/php-driver/
-  - http://datastax.github.io/php-driver/api/Cassandra/interface.Type/: https://docs.datastax.com/en/developer/php-driver/latest/api/Cassandra/class.Type/
-  - http://datastax.github.io/php-driver/features/http://localhost:8000/features/datatypes/: https://docs.datastax.com/en/developer/php-driver/latest/features/
 versions:
   - name: 1.3
     ref: HEAD