Metrics Docs Updates (#2560)

* Metrics Docs Updates

Updates to metrics docs to make them easier to follow

* Update metrics.md

* Update README.md

Something weird with this link. It is possible the site itself rejects the lint check

* Update index.rst

* Metric docs updates

Metrics docs updates based off comments.

* Metrics Updates

Updates per Naman's comments

* Update metrics.md

---------

Co-authored-by: Ankith Gunapal <[email protected]>

Author: sekyondaMeta

docs/index.rst

@@ -56,6 +56,14 @@ What's going on in TorchServe?
    :link: performance_guide.html
    :tags: Performance,Troubleshooting
 
+.. customcarditem::
+   :header: Metrics
+   :card_description: Collecting and viewing Torcherve metrics
+   :image: https://user-images.githubusercontent.com/5276346/234725829-7f60e0d8-c76d-4019-ac8f-7d60069c4e58.png
+   :link: metrics.html
+   :tags: Metrics,Performance,Troubleshooting
+
+
 .. customcarditem::
    :header: Large Model Inference
    :card_description: Serving Large Models with TorchServe