feat(docs): Added Update for documentation

[oindrila-b]

Description

1. Added images and modified instructions WRT google's new branding changes.
2. Added instructions for ensuring Ollama (being used with docker) is also working on host machine.
3. Added Steps (in card form) in the quickstart guide for better clarity.
4. Added information to add email of external users for those choosing External audience during OAuth consent screen.

Testing

Tested with bunx minlify dev.

Additional Notes

None so far.