Add deployment options in the '/doc'

[pagezyhf]

Hello,

This is a suggestion to make the doc our single source of truth for all things GCP:

• Added details on every way to deploy & train HF models on GCP in index
  • with HF DLC
  • from the Hub 'deploy on GCP'
  • from the Hub 'inference endpoints'
  • from the Model Garden
• Added short tutorial video for each way to deploy models on GCP - I'm not happy with it and would like to improve the demo video (better animation zooming on clicks, actually deploying an endpoint deployment) so consider it placeholder.
• Moved some info about HF DLC that where in the Getting Started section to the Deep Learning Containers section:
  • features & benefits
  • some stuff in index

@jeffboudier @alvarobartt @philschmid let me know what you think? Link to simplify review: https://moon-ci-docs.huggingface.co/docs/google-cloud/pr_98/en/index

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.