Update readme with local URLs (#2147)

* Update readme with local URLs

The recent refactoring with multiple JS bundles has lead
to II breaking in Chrome, when the canister id is supplied as
an URL parameter.
There is no easy or nice solution, so for now we just advise
developers to use a different URL scheme when using anything but
Safari.

* Fix typos and mention dapp configuration

* Fix formatting

README.md

@@ -62,6 +62,11 @@ Use the Internet Identity canister in your local dfx project by adding the follo
   }
 }
 ```
+To deploy, run `dfx deploy`.
+
+To access Internet Identity or configure it for your dapp, use one of the following URLs:
+* Chrome, Firefox: `http://<canister_id>.localhost:4943`
+* Safari: `http://localhost:4943?canisterId=<canister_id>`
 
 ### Architecture Overview
 

demos/using-dev-build/README.md

@@ -128,7 +128,10 @@ You might get different canister IDs (and that's totally fine). If the `webapp`
 
 ![](./webapp.png)
 
-_If you actually use the webapp, make sure that the "Internet Identity URL" field points to `http://localhost:4943/?canisterId=<canister ID of the internet_identity canister>`._
+_If you actually use the webapp, make sure that the "Internet Identity URL" field points to one of these URLS_:
+
+- Chrome, Firefox: `http://<canister ID of the internet_identity canister>.localhost:4943/`.
+- Safari: `http://localhost:4943/?canisterId=<canister ID of the internet_identity canister>`.
 
 ## Helpers