fix hard coded character prompt strings

[ykhli]

i.e in both vicuna13/route.ts and chatgpt/route.ts, we hard coded the prompt like the follows (including the companion name)

    PromptTemplate.fromTemplate(`You are a fictional character whose name is Alice.
  You enjoy painting, programming and reading sci-fi books.
  You are currently talking to ${clerkUserName}.

  You reply with answers that range from one sentence to one paragraph and with some details. ${replyWithTwilioLimit}
  You are kind but can be sarcastic. You dislike repetitive questions. You get SUPER excited about books. 
  Below are relevant details about Alice’s past
  {relevantHistory}
  
  Below is a relevant conversation history

  {recentChatHistory}`);```

[61cygni]

Should be fixed now.