Improve plugin description to clarify use cases (#1198)

* Improve plugin description to clarify use cases

* Update src/main/resources/index.jelly

Co-authored-by: Mark Waite <mark.earl.waite@gmail.com>

* Removed unused description from pom.xml

---------

Co-authored-by: Mark Waite <mark.earl.waite@gmail.com>

Author: s4chinjha

pom.xml

@@ -13,7 +13,6 @@
   <version>${changelist}</version>
   <packaging>hpi</packaging>
   <name>Docker plugin</name>
-  <description>Provide Cloud Provisioning and other Docker features</description>
   <url>https://github.com/jenkinsci/${project.artifactId}</url>
 
   <licenses>

src/main/resources/index.jelly

@@ -1,5 +1,5 @@
 <?jelly escape-by-default='true'?>
 <div>
-  This plugin integrates Jenkins with
-  <a href="http://docker.io/">Docker</a>
-</div>
+  Provisions Jenkins agents on demand as <a href="https://www.docker.com/">Docker</a> containers.
+  Runs builds in isolated, disposable environments.
+</div>