fix: remove link to browser extension to external repo. (#979)

packages/opentelemetry-browser-extension-autoinjection/README.md

@@ -14,14 +14,6 @@ Compatible with OpenTelemetry JS API and SDK `1.0+`.
 
 ## Installation
 
-### from Download
-
-* Go to [Releases](https://github.com/svrnm/opentelemetry-browser-extension/releases) and download the latest opentelemetry-browser-extension-<version>-<mv2|mv3>.zip from Assets.
-* Unzip that file locally
-* Open a new browser window and go to chrome://extensions
-* Turn on "Developer Mode"
-* Click on "Load unpacked" and the select the folder, where the unzipped extension lives.
-
 ### from Source
 
 Run the following in your shell to download and build the extension from source: