Abandoning the use of environment variables

- openaiApiKey
- openaiModelName

.env.example

@@ -1,2 +0,0 @@
-NUXT_OPENAI_API_KEY=YOUR_API_KEY
-NUXT_OPENAI_MODEL_NAME=text-davinci-003

nuxt.config.ts

@@ -9,8 +9,6 @@ export default defineNuxtConfig({
         },
     },
     runtimeConfig: {
-        openaiApiKey: '',
-        openaiModelName: 'text-davinci-003',
         public: {
             appName: appName
         }