Update FE README to describe new dev server

Release-Notes: skip
Change-Id: Ibdd1418c6d7b7e5384c431f246b2b210d56d5886
diff --git a/Documentation/dev-eclipse.txt b/Documentation/dev-eclipse.txt
index dce5eb0..79febe4 100644
--- a/Documentation/dev-eclipse.txt
+++ b/Documentation/dev-eclipse.txt
@@ -115,11 +115,11 @@
 
 == Testing
 
-=== The Gerrit web app UI is served by `server.go` process. To launch it,
+=== The Gerrit web app UI is served by `Web Dev Server`. To launch it,
 run this command:
 
 ----
-  $ bazel run polygerrit-ui:devserver
+  $ npm run start
 ----
 
 === Running the Daemon
diff --git a/polygerrit-ui/README.md b/polygerrit-ui/README.md
index 547894e..4e2ec7a 100644
--- a/polygerrit-ui/README.md
+++ b/polygerrit-ui/README.md
@@ -108,26 +108,16 @@
 
 ## Serving files locally
 
-#### Go server
+#### Web Dev Server
 
-To test the local Polymer frontend against production data or a local test site execute:
+To test the local frontend against production data or a local test site execute:
 
 ```sh
-./polygerrit-ui/run-server.sh
-
-// or
 npm run start
 ```
 
-These commands start the [simple hand-written Go webserver](https://gerrit.googlesource.com/gerrit/+/master/polygerrit-ui/server.go).
-Mostly it just switches between serving files locally and proxying the real
-server based on the file name. It also does some basic response rewriting, e.g.
-it patches the `config/server/info` response with plugin information provided on
-the command line:
-
-```sh
-./polygerrit-ui/run-server.sh --plugins=plugins/my_plugin/static/my_plugin.js
-```
+This command starts the [Web Dev Server](https://modern-web.dev/docs/dev-server/overview/).
+To inject plugins or other files, we use the [Gerrit FE Dev Helper](https://chrome.google.com/webstore/detail/gerrit-fe-dev-helper/jimgomcnodkialnpmienbomamgomglkd) Chrome extension.
 
 If any issues occured, please refer to the Troubleshooting section at the bottom or contact the team!