[Feature] Add Ollama URL input in the settings tab

Sometimes I like to spin up different ollama servers for testing so I thought it would be nice to have a settings page that lets you set the ollama url so you don't have to edit the .env.local and redeploy. 

Not sure if anyone would find that useful but figured I would put it out there. Also nice for when you forget to set it in the .env as well. 