Updates for reading old and writing new manifests

[crandmck]

• New section specifically on reading manifest data
  • New page on Reading legacy manifest data on reading old manifests / claims
• New section specifically on writing manifest data
• Update info on instance ID property. NOTE: This includes the change from org.cai.ingredientIds to ingredientIds.
• CAWG stuff:
  • Writing CAWG metadata assertions Removed per comment from @gpeacock
  • Reading CAWG metadata assertions

See also Changes in the v1.0 SDK release.

Review questions:

• https://deploy-preview-217--cai-open-source.netlify.app/docs/manifest/reading/legacy-manifests/#legacy-ingredients
• https://deploy-preview-217--cai-open-source.netlify.app/docs/manifest/reading/legacy-manifests/#legacy-actions
• https://deploy-preview-217--cai-open-source.netlify.app/docs/manifest/writing/assertions-actions/#v2-actions

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WIP Notes:

• To document: Hard binding types - Box hashes, etc.
• Reading: Don't display - Thumbnails, ingredients

New assertion types:

• Timestamp assertion
• Update assertion support

[github-actions]

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