update README to clarify GitHub token setup and add placeholder for OpenAI key

Author: ZibanPirate

api/README.md

@@ -24,8 +24,9 @@ NODE_ENV=development
 Keep in mind that you have limited calls to the GitHub API (60 calls per hour). The [FetchService](./api/src/fetch/service.ts) does a great job of caching these calls so it doesn't unnecessarily consume the GitHub API quota. If you wish to extend the limit from 60 to 5000, simply create a [GitHub Personal Access Token](https://github.com/settings/tokens) (make sure it has `Access public repositories` checked), and set it in `./api/.env` like this:
 
 ```.env
-GITHUB_TOKEN=Paste_Your_Token_Here
+GITHUB_TOKEN=Paste_your_token_here
 NODE_ENV=development
+OPENAI_KEY=Pase_your_key_here
 ```
 
 **Note:** If the README is still unclear, please create a PR with your suggested changes/additions.

api/src/config/types.ts

@@ -42,5 +42,5 @@ export class EnvRecord {
   MEILISEARCH_MASTER_KEY = "default";
 
   @IsString()
-  OPENAI_KEY!: string;
+  OPENAI_KEY = "no-key";
 }