feat: Allow specifying allowed hosts in Vite config

- Adds `allowedHosts` option to Vite config for specifying allowed
  hosts during development.  This is necessary for connecting to
  specific QA environments.

sweb/vite.config.ts

@@ -2,12 +2,14 @@ import { defineConfig } from 'vite'
 import { svelte } from '@sveltejs/vite-plugin-svelte'
 import { resolve } from 'path'
 
-// https://vite.dev/config/
 export default defineConfig({
   plugins: [svelte()],
   resolve: {
     alias: {
       $lib: resolve('./src/lib')
     }
+  },
+  server: {
+    allowedHosts: ['secureweb.gent01.qa.grid.tf']
   }
 })