Remove bigtable samples from here (moving to java-docs-samples) (#5215)

Author: billyjacobson

google-cloud-examples/pom.xml

@@ -29,10 +29,6 @@
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-bigquery</artifactId>
     </dependency>
-    <dependency>
-      <groupId>com.google.cloud</groupId>
-      <artifactId>google-cloud-bigtable</artifactId>
-    </dependency>
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-compute</artifactId>