Add a new apiHost configuration for local development (#655)

## Description:

Allow developers to override the API base.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

Co-authored-by: Scott Anderson <662325+scottanderson@users.noreply.github.com>

src/client/jwt.ts

@@ -16,7 +16,7 @@ function getAudience() {
 function getApiBase() {
   const domainname = getAudience();
   return domainname === "localhost"
-    ? "http://localhost:8787"
+    ? (localStorage.getItem("apiHost") ?? "http://localhost:8787")
     : `https://api.${domainname}`;
 }