Updating Overview section of Tekton

fixing the overview section markdown metadata so it is visually consistent with the other sections of the doc

content/en/docs/getting-started-overview.md → content/en/docs/Overview/_index.md

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+title: "Overview of Tekton"
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+description: >
+  Components, benefits and caveats, common usage.
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-# Overview of Tekton
-
-This document describes Tekton, its components, as well as its benefits and caveats. It also describes the most
-common usage scenarios for Tekton.
-
 ## What is Tekton?
 
 Tekton is a cloud-native solution for building CI/CD pipelines. It consists of Tekton Pipelines, which provides