fixed issues w/ accessing website on other computers

docs/demo_script.md

@@ -5,16 +5,22 @@ Target length: **2 minutes 45 seconds**, embedded in the
 
 ## Before the audience arrives
 
-1. From the repository root, run `node dashboard/server.mjs`.
-2. Open `http://127.0.0.1:4173/#overview`.
-3. Confirm the header says the sample aggregates validated.
-4. Confirm the private-sample development-preview banner is visible.
-5. Visit all four routes: Overview, Sample cohorts, Model & benchmark, and Data
+1. Put the presenting computer and demo computer on the same trusted network.
+2. Stop any older dashboard process, then from the repository root run
+   `node dashboard/server.mjs --lan`.
+3. On the demo computer, open the printed **Other devices** URL for the shared
+   Wi-Fi or Ethernet interface with `/#overview` appended. On the presenting
+   computer, use the printed **This computer** URL.
+4. Confirm the header says **Validated sample aggregates**. If an older copy of
+   the JavaScript was previously loaded, hard-refresh the page once.
+5. Confirm the private-sample development-preview banner is visible.
+6. Visit all four routes: Overview, Sample cohorts, Model & benchmark, and Data
    & methods.
-6. Reset Sample cohorts and leave its sort on largest support.
+7. Reset Sample cohorts and leave its sort on largest support.
 
 Do not open developer tools, private files, model artifacts, database clients,
-or environment variables during the presentation.
+or environment variables during the presentation. Stop the server with
+`Ctrl-C` when the demo is over.
 
 ## Live talk track