Demo docs: final post-move cleanup (open-telemetry#2327)

Author: chalin

README.md

@@ -1,4 +1,4 @@
-# <img src="https://opentelemetry.io/img/logos/opentelemetry-logo-nav.png" alt="OpenTelemetry Icon" width="45" height=""> OpenTelemetry.io
+# <img src="https://opentelemetry.io/img/logos/opentelemetry-logo-nav.png" alt="OTel logo" width="45"> OpenTelemetry.io
 
 This is the source repo for the [OpenTelemetry][] website, project documentation
 and blog. The site is [built][contributing.md] using [Hugo][] and hosted on

content/en/docs/demo/_index.md

@@ -5,9 +5,9 @@ cascade:
   repo: https://github.com/open-telemetry/opentelemetry-demo
 ---
 
-Welcome to the OpenTelemetry Demo! This folder contains overall documentation
-for the project, how to install and run it, and some scenarios you can use to
-view OpenTelemetry in action.
+Welcome to the [OpenTelemetry Demo](/ecosystem/demo/) documentation, which
+covers how to install and run the demo, and some scenarios you can use to view
+OpenTelemetry in action.
 
 ## Running the Demo