[FEAT] Implement model provider UI updates (#996)

* implement new LLM preference UI

* implement new vector db preferences UI to match LLM preferences

* implement new embedding preferences UI to match LLM preferences

* normalize placeholder text for search input

* implement new transcription preferences UI to match LLM preferences

* remove uneeded css

* implement new UI for llm preference onboarding

* implement new UI for embedder preference onboarding

* implement new UI for vector db preference onboarding

* fix placeholder text

* unset onboarding

* move autocomplete field

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Co-authored-by: timothycarambat <rambat1010@gmail.com>