otel-js website_docs at HEAD (#722)

* otel-js docs from feea5167
* Fix broken links to exporters
* Add back the link to Getting started

content/en/docs/js/_index.md

@@ -1,9 +1,14 @@
 ---
-title: "Javascript"
+title: Javascript
 weight: 20
-description: >
-  <img width="35" src="https://raw.github.com/open-telemetry/opentelemetry.io/main/iconography/32x32/JS_SDK.svg" alt="JavaScript logo"></img>
+description: >-
+  <img width="35" src="https://raw.github.com/open-telemetry/opentelemetry.io/main/iconography/32x32/JS_SDK.svg"></img>
   A language-specific implementation of OpenTelemetry in JavaScript (for Node.JS & the browser).
+cascade:
+  github_repo: &repo https://github.com/open-telemetry/opentelemetry-js
+  github_subdir: website_docs
+  path_base_for_github_subdir: content/en/docs/js/
+  github_project_repo: *repo
 ---
 
 This page contains an introduction to OpenTelemetry in JavaScript. This guide