When serving a website, delete the unzipped directory if the index file is not found.

This is a quick solution to rebuild directory structures with missing files. This whole area of the code needs some reworking, as serving the site from a temporary folder is not a robust long term solution.

pom.xml

@@ -450,6 +450,11 @@
 			<artifactId>commons-text</artifactId>
 			<version>${commons-text.version}</version>
 		</dependency>
+		<dependency>
+			<groupId>commons-io</groupId>
+			<artifactId>commons-io</artifactId>
+			<version>2.6</version>
+		</dependency>
 		<!--  For bitset/bitmap compression -->
 		<dependency>
 			<groupId>io.druid</groupId>