Update page nav structure

[bot-api-video]

Changes are for this Asana task.

Summary:

• Move and rename Analytics page
• Move and rename Authentication page
• Rename Bearer Token Authentication page
• Fix Loom clone page title to Loom mockup
• Hide currently empty pages from all navigation.yaml files:

- label: How to - analytics with api.video Player SDK
      href: /delivery-analytics/how-to-player-sdk-analytics.md
- label: Video security best practices
      href: /delivery-analytics/video-security-best-practices.md
- label: Delivery best practices
    href: /delivery-analytics/player-best-practices.md
- label: Downloading videos
      href: /vod/downloading-videos.md
- label: Video tagging
    href: /vod/video-tagging.md

Created by @szekelyzol via apivideo/api.video-api-client-generator#248