Update Quickstart Guide (#398)

- To make the command easier to copy and paste, the `$` symbol was removed.
- Removed duplicate table of contents

Authors:
  - Bhargav Suryadevara (https://github.com/bsuryadevara)
  - https://github.com/bsuryadev

Approvers:
  - Michael Demoret (https://github.com/mdemoret-nv)

URL: #398

README.md

@@ -181,7 +181,7 @@ Several examples on using the Morpheus CLI can be found at [`docs/source/basics/
 When configuring a pipeline via the CLI, you start with the command `morpheus run pipeline` and then list the stages in order from start to finish. The order that the commands are placed in will be the order that data flows from start to end. The output of each stage will be linked to the input of the next. For example, to build a simple pipeline that reads from Kafka, deserializes messages, serializes them, and then writes to a file, use the following:
 
 ```bash
-$ morpheus run pipeline-nlp from-kafka --input_topic test_pcap deserialize serialize to-file --filename .tmp/temp_out.json
+morpheus run pipeline-nlp from-kafka --input_topic test_pcap deserialize serialize to-file --filename .tmp/temp_out.json
 ```
 
 You should see some output similar to: